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Quick Picks: Comparison Table
| Product (Exact Name) | Best For | Published Capacity | Price |
|---|---|---|---|
| POLESTAR Electric Trailer Jack | Powered A-frame lifting with a drop leg | 5,000 lbs dynamic / 7,500 lbs static | Check Price on Amazon |
| OULEME 9500 lbs RV Camper Scissor Jack | The highest published scissor capacity here | 9,500 lbs | Check Price on Amazon |
| Kohree 7500lbs RV Stabilizer Leveling Scissor Jacks 24" | Drill-driven stabilizers with a wide bow-tie base | 7,500 lbs | Check Price on Amazon |
| OX BLOX Heavy Duty Trailer Jack Block - 10,000 lb Capacity - Made in USA | A per-block rating that holds when stacked | 10,000 lbs per block | Check Price on Amazon |
| VEVOR Trailer Jack Block | Covering four jack feet in one purchase | 6,000 lbs per block | Check Price on Amazon |
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Last Updated: September 2026
Campsite setup lives or dies on two pieces of hardware: the jack that carries your tongue weight, and the feet that stop the trailer rocking every time somebody walks to the fridge. Get either one wrong and you spend the weekend chasing a wobble you can't fix.
This roundup covers related categories of campsite setup hardware. There's one electric A-frame tongue jack, two 24-inch scissor stabilizer sets, and seven jack blocks and pads that sit between your jack foot and whatever the campground calls a surface.
Here's the thing about this page: nobody here has touched any of these products. This website does not do hands-on testing. What follows is a close reading of published manufacturer specifications and Amazon listing feature bullets, retrieved on 2026-09-10, with opinionated conclusions drawn from the numbers those listings publish. Where a spec isn't stated in the supplied listing information, we say so rather than guessing.
If you're also sorting out the towing end of your setup, see our guides to weight distribution hitches and RV wheel chocks.
- Heavy Duty Electric Trailer Jack - The POLESTAR 5000 lbs Electric Trailer Jack is built for powerful lifting power, designed to effortlessly handle trailers, RVs, boats, and
- Advanced Ball Screw Design for Superior Efficiency - At the heart of the POLESTAR electric trailer jack is its advanced ball screw design, which ensures smooth, efficient lifting
- Heavy-Duty Performance: Heavy-duty 9,500 lbs capacity for effortless RV/trailer leveling; wide-base construction delivers enhanced stability under load
- Wide Adjustment Range: Versatile height adjustment from 4" to 24" to suit various trailer frames. (Retracted: 26"L x 5"W x 4"H; Fully Extended: 24"H)
- 【Heavy Duty Steel】: Made of heavy-duty steel with electrophoresis on the surface so that it is durable and strong enough to stabilize and level most RVs
- 【Specification】: Designed with plenty of room for you to stretch the RV scissor jack in 24” maximum height, 4” retracted height, 26" retracted length, and 7.3" width
- Strongest Trailer Jack Block on the Market: Rated up to 10,000 lbs per block, OX BLOX are built to handle tongue jacks, post jacks, foot jacks, scissor jacks, and stabilizer jacks
- Stable on Any Surface: The patented design (US 11,673,440 B2) keeps your trailer stable on gravel, grass, dirt, and pavement. Engineered by Utah-based designers to eliminate
- Effortless Leveling: Improve your camping experience with our trailer jack blocks! Our blocks make leveling your RV a breeze, ensuring stability and comfort even on the most
- Swift Setup: No complex installations are required! Our RV camper blocks can be effortlessly positioned in minutes, and you can stack the jack blocks to adjust the height
- Sturdy & Robust: Our RV trailer jack blocks are built with a high-performance polymer and added anti-UV aging additives to resist dirt, grime and oil for years of rugged use
- Widely Used: The trailer jack block supports nearly
- Sturdy & Robust: Our RV trailer jack blocks are built with a high-performance polymer and added anti-UV aging additives to resist dirt, grime and oil for years of rugged use
- Widely Used: The trailer jack block supports nearly
- 8" Extra Height: The increased height of the 5th wheel accessories means your jack doesn't need to extend as far, greatly improving the efficiency and stability of leveling. This
- Built to Last: Crafted from high-performance polymer, the RV jack blocks hold up against sun exposure, mud, and oil. Integrated drainage holes ensure no water accumulation even on
Tongue Jack vs. Stabilizer Jack vs. Jack Block
A tongue jack lifts and supports the front of the trailer at the coupler, so it carries real tongue weight and has to raise the rig off the hitch ball. A stabilizer jack, usually a scissor unit bolted under the frame, is there to kill sway and bounce once the trailer is parked and level. A jack block is the pad underneath either one, spreading load so the foot doesn't sink into gravel, grass or soft dirt.
That split matters for shopping. A capacity number on a scissor stabilizer is not permission to lift a wheel off the ground; check the manufacturer's own instructions before you use any stabilizer as a lifting device. Neither the Kohree nor the OULEME listing describes these jacks as a substitute for a service jack or jack stands when working under a trailer.
The Picks
POLESTAR Electric Trailer Jack — Best for powered A-frame lifting with a long drop-leg reach
Look, if your back has opinions about hand-cranking a loaded tongue, this is the category that solves it. POLESTAR rates this A-frame jack for a dynamic load of up to 5,000 lbs and static lifting power reaching 7,500 lbs, and the listing does not define what either figure covers, so ask POLESTAR which duty each number describes.
The geometry is the interesting part. The lift range runs from 9 inches retracted to 27 inches, plus a 4.5-inch drop leg for up to 31.5 inches. That extra drop leg is what lets you reach the ground on a site that slopes away from the tongue without maxing out the powered travel, and it means less screw extension carrying load at full height.
POLESTAR describes a ball screw drive paired with a brake motor, and the listing includes a waterproof rain cover plus a built-in circuit breaker that trips and resets automatically if amperage runs too high. LEDs shine down onto the ball and coupler, which is a small feature that earns its keep during a dusk arrival.
Pros
- Dual capacity figures published: 5,000 lbs dynamic, 7,500 lbs static.
- 31.5 inches of total reach with the 4.5-inch drop leg deployed.
- Ball screw and brake motor design, per the manufacturer.
- Rain cover and self-resetting circuit breaker included.
- Coupler-area LED lighting for night hookups.
- The supplied listing information does not state the jack's mounting tube diameter, amp draw, wire gauge, or bolt pattern, so confirm A-frame fitment and wiring requirements with POLESTAR before ordering.
- Any electric jack adds a 12V circuit to your trailer; the product's rating tells you nothing about your trailer's existing wiring, so have that side verified.
Verdict: Buy this for the drop leg reach on uneven sites. The POLESTAR Electric Trailer Jack, 5000lbs Electric Power A-Frame Tongue Jack listing does not define whether its 5,000 lb dynamic figure refers to tongue load or towed trailer weight, so ask POLESTAR how that rating relates to your loaded tongue weight before buying.
OULEME 9500 lbs RV Camper Scissor Jack — Best for the highest published stabilizer capacity in this roundup
OULEME publishes a heavy-duty 9,500 lbs capacity for the OULEME 9500 lbs RV Camper Scissor Jack without stating whether that figure is per jack or per set, and lists a height range of 4 to 24 inches plus retracted dimensions of 26 inches long, 5 inches wide, and 4 inches high. Of the two scissor jack sets here, OULEME publishes the higher capacity figure at 9,500 lbs.
What I like on paper is that this ships ready to install. The OULEME 9500 lbs RV Camper Scissor Jack, 24" Trailer Leveling Stabilizer 2PK (ASIN B0GF7P8V6G) listing describes an all-inclusive package: 1 manual crank handle, 1 drill socket (3/4"), 8 mounting screws (3/8"), and a detailed instruction manual, ready to use out of the box. Scissor jacks that arrive without hardware turn a 30-minute job into a hardware-store trip, so the included 3/8-inch screws are a genuine convenience.
OULEME describes high-tensile steel construction and zinc-chromate-finished hardware that it says passes salt spray testing. Treat that as the manufacturer's own corrosion claim rather than independent certification, but it's the kind of detail that matters if you camp near salt water or store outdoors through a road-salt winter.
Pros
- 9,500 lb published capacity, the highest of the two scissor sets covered here.
- Wide 4-inch to 24-inch working range.
- Mounting screws, crank handle and drill socket all included.
- Manufacturer cites zinc-chromate hardware and salt spray testing.
- Slim 5-inch retracted width for tight frame clearances.
- The retracted height is 4 inches, so measure your frame-to-ground clearance; a low-slung trailer may not have room.
- The supplied listing information does not state a warranty length.
Verdict: The pick for a heavier travel trailer owner who wants the biggest published number and doesn't want to source mounting hardware separately.
Kohree 7500lbs RV Stabilizer Leveling Scissor Jacks 24" — Best for a wide-base stabilizer you can run with a drill out of the box
Kohree publishes a 7,500 lb rating for the Kohree 7500lbs RV Stabilizer Leveling Scissor Jacks 24"; the listing lists a 24-inch maximum height, a 4-inch retracted height, a 26-inch retracted length, and a 7.3-inch width, plus a wide bow-tie base with no published base dimensions. The OULEME 9500 lbs RV Camper Scissor Jack lists a 5-inch retracted width and describes wide-base construction without publishing base dimensions either, so these width figures do not establish which jack has the broader contact patch at the ground.
Kohree describes heavy-duty steel with an electrophoresis surface finish and a wide bow-tie base. Electrophoretic coating is a dip-and-electrocharge process that gets paint into weld seams and inside corners, which is exactly where scissor jacks tend to start rusting first. Whether it outlasts the zinc-chromate hardware OULEME cites is not something the supplied listings answer.
The listing describes a crank handle for raising and lowering, notes that a power drill is faster but is not included, and says the box contains two stabilizer jacks, one crank handle, and one drill bit. Kohree also notes the jacks can be used with the Kohree RV stabilizer jack pad.
Pros
- 7,500 lb published capacity, stated on the listing as "24" RV stabilizing scissor jack 7500lbs".
- 7.3-inch published width, with a wide bow-tie base.
- Drill bit included so the jacks are drill-ready immediately.
- Electrophoresis surface treatment on heavy-duty steel.
- Same 4-inch to 24-inch working range as the OULEME set.
- The supplied listing information does not state that mounting screws are included, so check with Kohree for its approved mounting method and hardware before installing.
- The power drill is explicitly not included.
Verdict: Choose this set if the electrophoresis-coated steel finish and the published 7.3-inch width of the Kohree 7500lbs RV Stabilizer Leveling Scissor Jacks 24" matter most to you. The Kohree 7500lbs RV Stabilizer Leveling Scissor Jacks 24", Set of 2 (ASIN B08C26WRW1) listing publishes a 7,500 lb capacity figure. The OULEME 9500 lbs RV Camper Scissor Jack publishes a 9,500 lbs capacity figure.
OX BLOX Heavy Duty Trailer Jack Block - 10,000 lb Capacity - Made in USA — Best for a per-block rating that's stated to hold when stacked
This is the block with the most specific engineering story. OX BLOX rates each block at up to 10,000 lbs and says that rating holds when blocks are stacked. That second half is the part shoppers skip, and it's the one that counts: a lot of blocks publish a flat rating and go quiet about what happens at two or three high.
The listing cites a patented design, US 11,673,440 B2, and describes compression molding from recycled plastic in the USA. A granted patent number is a checkable fact, which is more than most blocks in this category offer. Each block weighs just over 8 lbs and has grab handles on each side.
OX BLOX calls itself the strongest trailer jack block on the market. That's the seller's own marketing claim, and it isn't directly comparable to the G.V.W. figures other brands publish, because a per-block load rating and a gross vehicle weight number measure different things.
Pros
- 10,000 lb per-block rating that the manufacturer says is maintained when stacked.
- Granted US patent number published on the listing.
- The OX BLOX Heavy Duty Trailer Jack Block - 10,000 lb Capacity - Made in USA (ASIN B09DMM51FP) listing describes the blocks as compression-molded from recycled plastic in the USA, and as UV and temperature resistant.
- Grab handles on each side.
- Stated compatibility with tongue, post, foot, scissor and stabilizer jacks, round or square.
- The supplied listing information does not state the block's height, footprint dimensions, or pack quantity.
- At just over 8 lbs each, it's the heaviest block here with a published weight, which matters if you carry four of them.
Verdict: The block to buy when you want a stated stacked load rating and a verifiable patent behind the design rather than a bare capacity headline.
VEVOR Trailer Jack Block — Best for outfitting four jack feet in a single purchase
VEVOR rates each block at 6,000 lbs and ships them in a 4-pack. For a travel trailer with four scissor stabilizers, that's the whole corner set in one box, which is the practical reason to look here first.
They're polypropylene, stackable for height adjustment, and have an integrated drainage hole. VEVOR says the material resists UV exposure, water, high temperatures, oil, tar, and soil. The drainage hole is a small thing that stops a block from becoming a standing puddle and a mosquito nursery between trips.
Pros
- 6,000 lb per-block rating, four blocks per set.
- Polypropylene construction with stated UV, water, heat, oil and tar resistance.
- Integrated drainage hole.
- Stackable for on-site height adjustment.
- No installation required.
- The supplied listing information does not state per-block dimensions or weight, so you can't plan storage space from the listing alone.
- The 6,000 lb per-block figure is the lowest published block rating in this roundup, though the ratings across these blocks are not all expressed on the same basis.
Verdict: The straightforward choice if you need four pads at once and don't need a published dimension sheet.
ROBLOCK 6''H 4 PCS Trailer Jack Block with Bag — Best for a full four-corner set with a published footprint
ROBLOCK lists these blocks at about 6 inches tall with an 11.5-inch by 11.5-inch footprint and a G.V.W. rating of 40,000 lbs per block. This is the four-pack, so you get the same block on all four corners plus the storage bag.
They're a high-performance polymer with anti-UV aging additives, and they ship with a rope and a storage bag. ROBLOCK says they suit nearly any tongue jack foot, wheel jacks, 9-inch round fifth-wheel hydraulic jack feet, or scissor stabilizers. That 9-inch round fifth-wheel figure is useful specificity — an 11.5-inch square face leaves margin around a 9-inch round foot.
Pros
- Published 11.5 x 11.5 inch footprint at about 6 inches tall.
- G.V.W. 40,000 lbs per block, per the manufacturer.
- Four blocks plus a storage bag in one purchase.
- Stated fit for 9-inch round fifth-wheel hydraulic jack feet.
- Carry rope and side hole for handling.
- The supplied listing information does not state per-block weight.
- A 6-inch block gives less lift than the 8-inch options here if your site drops away sharply.
Verdict: Buy this version over the single if you're equipping a trailer's full corner set and want the bag included.
ROBLOCK 6''H Trailer Jack Block with Bag — Best for adding one spare block to a kit you already own
Same block, single pack. ROBLOCK lists this block at about 6 inches tall with an 11.5-inch by 11.5-inch footprint and a G.V.W. rating of 40,000 lbs per block, built from a high-performance polymer with anti-UV aging additives.
The single is the one to grab when you've already got pads under three corners and the fourth keeps sinking, or when you want one dedicated tongue-jack block that lives in the truck bed. It ships with the rope and storage bag as well.
Pros
- Identical published specs to the four-pack in a one-block purchase.
- 11.5 x 11.5 inch footprint spreads load well under a small jack foot.
- Storage bag and carry rope included.
- Stackable with additional blocks for height.
- One block only, so it's a top-up buy rather than a full kit.
- The supplied listing information does not state per-block weight.
Verdict: The right call for a targeted single-corner fix or a dedicated tongue jack pad.
ROBLOCK 8"H Trailer Jack Block with Handle — Best for interlocking stacks when your jack shouldn't extend far
ROBLOCK lists 12 x 12 x 8 inches per block, 3.75 lbs each, and a G.V.W. rating of 40,000 lbs. The company describes an interlocking design for firm stacking and integrated drainage holes.
ROBLOCK's own reasoning for the 8-inch height is that your jack doesn't need to extend as far, which it says improves leveling efficiency and reduces wear on the jack. That logic holds up: less screw extension under load generally means a shorter unsupported column, and on a fifth-wheel landing gear that's a real consideration.
The interlocking stack is the differentiator against a plain flat pad. A stack that keys together is less likely to skate sideways when the trailer settles.
Pros
- 8-inch height with a 12 x 12 inch footprint.
- Just 3.75 lbs per block, with a handle and rope.
- Interlocking stacking design that nests for storage.
- G.V.W. 40,000 lbs, per the manufacturer.
- Integrated drainage holes.
- Sold as a 1 pack, so a four-corner setup means four purchases.
- The supplied listing information does not state a stacked-load rating, so ask ROBLOCK before building a tall stack under load.
Verdict: The 8-inch pick for owners who want height plus a stack that keys together.
HOXWELL 8''High RV Trailer Jack Block with Handle — Best for the lightest 8-inch block to carry around a site
HOXWELL lists this block at 12 x 12 x 8 inches and 2.87 lbs, with a GVW rating of 40,000 lb (18T). That 2.87 lb figure is the lowest published block weight in this roundup, and if you're moving four blocks around a wet site at dusk, weight is not a trivial spec.
It has a built-in weep hole for drainage, a handle and rope, and HOXWELL says the blocks nest compactly for storage. The manufacturer describes reinforced internal structures and says it withstands heavy loads without cracking on grass, gravel roads, or mud.
HOXWELL also markets the block as doubling as a sturdy outdoor seat at your campsite. Take that as the seller's suggestion; a jack load rating is not a seating rating, and the listing doesn't publish one.
Pros
- 2.87 lbs per block, the lightest published weight here.
- Full 12 x 12 x 8 inch dimensions published.
- GVW 40,000 lb (18T) manufacturer rating.
- Weep hole drainage, handle and rope.
- Nests compactly when stored.
- Sold as a 1 pack in orange only, per the listing title.
- The supplied listing information does not state a stacked-load rating.
Verdict: Pick this when carry weight and packability drive the decision more than a branded name.
6''Height Trailer Jack Block, 40,000lbs RV Camper Stabilizer Blocks — Best for a locking stack on genuinely uneven ground
This block starts at 6 inches tall and is rated to support up to 40,000 pounds per pad. It's a high-performance polymer with UV, oil, water, heat, and stain resistance, with side holes, a rope, and drainage holes.
The headline feature is the stack. The listing describes a locking stacking mechanism that it says prevents dangerous shifting and maintains load-bearing capacity when stacked. Among the blocks here, only OX BLOX and this one make an explicit statement about capacity while stacked, which is the claim I'd want on a site where I need two blocks high under a tongue jack.
Pros
- 40,000 lb per-pad rating published.
- Locking stack that the seller says holds capacity when stacked.
- Broad chemical and weather resistance claims: UV, oil, water, heat, stain.
- Side holes and rope for carrying.
- Drainage holes to prevent water pooling.
- The supplied listing information does not state a brand name, footprint dimensions, block weight, or pack quantity.
- Missing dimensions make it hard to confirm the face is large enough for a wide fifth-wheel foot.
Verdict: Worth a look if the locking stack is your priority and you're willing to confirm dimensions with the seller first.
What to Look For
- Match the rating to the job, not the trailer. A tongue jack rating covers tongue weight, not gross trailer weight. POLESTAR publishes a dynamic load of up to 5,000 lbs and static lifting power reaching 7,500 lbs, but its listing does not separate tongue weight from gross trailer weight and does not state the basis of the 5,000 lb figure; read every listing for that distinction.
- Check retracted height against your frame clearance. Both scissor sets here retract to 4 inches. If your frame sits lower than that above the ground at the mounting point, the jack won't fit.
- Confirm what hardware is in the box. The OULEME 9500 lbs RV Camper Scissor Jack listing states that eight 3/8-inch mounting screws are included. The Kohree 7500lbs RV Stabilizer Leveling Scissor Jacks 24" listing does not state that screws are included.
- Read block ratings for their basis. A 10,000 lb per-block figure and a 40,000 lb G.V.W. figure are not the same measurement, and the supplied listings don't give you a common test method to compare them.
- Look for a stated stacked rating. The OX BLOX Heavy Duty Trailer Jack Block - 10,000 lb Capacity - Made in USA (ASIN B09DMM51FP) listing says the blocks are rated to 10,000 lbs even when stacked. Most listings here say a block is stackable without saying what it holds at height.
- Weight and carry features matter more than you think. The HOXWELL 8''High RV Trailer Jack Block with Handle listing publishes a weight of 2.87 lbs per block. The OX BLOX Heavy Duty Trailer Jack Block - 10,000 lb Capacity - Made in USA listing publishes a weight of just over 8 lbs each.
- Drainage. Weep or drainage holes appear on the VEVOR, HOXWELL, ROBLOCK 8-inch and unbranded 6-inch blocks.
How We Research
Every specification on this page comes from two source types and nothing else: Amazon Creators API verified product records and product listing feature bullets, all retrieved on 2026-09-10. We read each ASIN's own bullets in full, pulled out the published numbers, and compared them only where the same attribute appears on more than one listing.
Where a figure isn't in the record, we flag it as not stated in the supplied listing information rather than substituting a plausible number. Manufacturer claims are attributed to the manufacturer, because a seller's bullet is not independent verification. For general consumer safety and recall information, the CPSC publishes federal consumer product safety resources at cpsc.gov, and USA.gov maintains consumer protection guidance.
Recommendations by Use Case
If you want to stop hand-cranking a heavy tongue: the POLESTAR Electric Trailer Jack, on the strength of its 5,000 lb dynamic rating and 31.5 inches of total reach with the 4.5-inch drop leg.
If you want the highest published stabilizer capacity: the OULEME 9500 lbs RV Camper Scissor Jack at 9,500 lbs, with mounting screws and a 3/4-inch drill socket in the box.
If you want a wider scissor body: the Kohree 7500lbs RV Stabilizer Leveling Scissor Jacks 24" at 7.3 inches wide with an electrophoresis-coated steel finish.
If you plan to stack blocks under a tongue jack: OX BLOX Heavy Duty Trailer Jack Block - 10,000 lb Capacity - Made in USA, because the manufacturer states the 10,000 lb rating holds when stacked.
If you need all four corners covered at once: the VEVOR Trailer Jack Block 4-pack at 6,000 lbs per block, or the ROBLOCK 6''H 4 PCS set at a published 11.5 x 11.5 inch footprint.
If storage space and carry weight decide it: the HOXWELL 8''High RV Trailer Jack Block at 2.87 lbs.
Final Verdict
Build the setup in two halves. For the tongue, the POLESTAR Electric Trailer Jack is the one worth the money here, because its published 9-inch to 27-inch range plus a 4.5-inch drop leg gives you 31.5 inches of reach — enough to handle a site that falls away in front of the coupler without running the powered screw to its limit.
For stabilizers, I'd take the OULEME 9500 lbs RV Camper Scissor Jack. Not because a bigger number is automatically better, but because it arrives with eight 3/8-inch mounting screws and a 3/4-inch drill socket, so it's genuinely install-ready, and 9,500 lbs is the higher of the two published scissor figures on this page.
Under all of it, put blocks. OX BLOX earns the nod for the specific reason that it publishes a stacked load statement — 10,000 lbs per block, maintained when stacked — which is the exact scenario that gets people into trouble on a badly graded site. If you'd rather buy four at once, the VEVOR 4-pack at 6,000 lbs per block is the simpler purchase.
Frequently Asked Questions
A tongue jack lifts and supports the coupler end of the trailer and carries tongue weight; a stabilizer jack, typically a scissor unit under the frame, reduces movement once the trailer is already parked and level. The POLESTAR Electric Trailer Jack is the A-frame tongue jack in this roundup, while the Kohree and OULEME sets are 24-inch scissor stabilizers.
Do I really need jack blocks under stabilizer jacks?
On pavement, less so. On grass, gravel, dirt or mud, a block spreads the load over a much larger area than the jack foot alone. ROBLOCK's 6-inch blocks publish an 11.5 x 11.5 inch footprint, and the HOXWELL and ROBLOCK 8-inch blocks are 12 x 12 inches, which is far more contact area than a bare scissor foot.
How much tongue jack capacity do I need?
Size it to your loaded tongue weight, not your trailer's gross weight, and leave headroom. POLESTAR publishes a dynamic load of up to 5,000 lbs and static lifting power reaching 7,500 lbs; the listing does not define what those dynamic and static figures cover, so ask POLESTAR to confirm before sizing a jack.
Can I run scissor jacks with a cordless drill?
Both scissor sets here are built for it. Kohree's listing says a power drill is faster but is not included, and ships a drill bit in the box; OULEME includes a 3/4-inch drill socket. Follow each manufacturer's guidance on speed and torque limits.
What about swing-down stabilizer jacks, the Husky HB4500 Brute power jack, or BAL 24830 telescopic stabilizing jacks?
Those are common searches, and swing-down jacks in particular are a different mounting style from the scissor units covered here. We don't have published specification records for the Husky HB4500 Brute or the BAL 24830 in hand, so we're not going to characterize their capacities, dimensions or performance on this page.
Are the 40,000 lb blocks really stronger than the 10,000 lb OX BLOX?
Not necessarily, and this is the trap. OX BLOX rates each block at up to 10,000 lbs and says that rating holds when blocks are stacked, while several other blocks here publish a G.V.W. 40,000 lbs figure. Those are different measurements on different bases, and the supplied listings don't provide a shared test method that would let you rank them.
Can I stack jack blocks safely?
Only to the height the manufacturer supports. The OX BLOX Heavy Duty Trailer Jack Block - 10,000 lb Capacity - Made in USA listing states its 10,000 lb rating is maintained when stacked. The 6''Height Trailer Jack Block, 40,000lbs RV Camper Stabilizer Blocks listing describes a locking stacking mechanism that it says prevents dangerous shifting. Where a listing says a block is stackable but publishes no stacked rating, ask the manufacturer before going more than one high under load.
Sources & Methodology
This site did not physically or laboratory-test any jack, stabilizer or block on this page, and no one here has lifted a trailer with them. What we did do is read each product's Amazon Creators API verified product record and every published listing feature bullet as retrieved on 2026-09-10, then compare only the attributes that more than one manufacturer actually publishes — capacity, retracted and extended height, footprint, block weight and included hardware.
For RV jacks and pads specifically, that kind of spec reading gets you a long way, because the decisions that matter are dimensional: will it fit your frame clearance, will it reach the ground at your site, will the pad cover your jack foot, and did the seller state what happens when blocks are stacked. It cannot tell you how a gearbox holds up after five seasons or how a polymer behaves at -20F, and we don't pretend otherwise.