Roughly 11.2 million U.S. households now own an RV, according to the RV Industry Association’s ownership survey, and nearly all of them will eventually park on a site that isn’t flat (RV Industry Association, retrieved 2026). A trailer or motorhome sitting even two or three degrees off level can cause a refrigerator’s cooling loop to run poorly, doors to swing open on their own, and a bubble level argument at the campsite that ruins the first twenty minutes of every trip. Leveling blocks solve this cheaply and quickly — but the interlocking-block category and the curved-ramp category solve slightly different problems, and picking the wrong style, or the wrong weight rating, is the most common mistake first-time buyers make.
Key Takeaways
- Interlocking stack blocks (Camco FasTen, Lynx, Valterra) build height in known increments and are the better choice for tandem-axle trailers that need real elevation.
- Curved ramp levelers (Andersen, Tri-Lynx) correct smaller amounts of unevenness in one drive-on motion and work best for single-axle trailers and motorhomes.
- Weight ratings for name-brand block kits run from about 20,000 lb to 35,000 lb GVWR — check your trailer’s actual loaded weight, not just its dry weight, before buying.
- Most kits are rated to correct up to about 4–5 inches per axle side before you should stop stacking and reposition the rig instead.
- Leveling blocks handle side-to-side and front-to-back elevation; they don’t stop rolling or rocking on their own, which is what wheel chocks and stabilizing jacks are for.
Stack Blocks vs. Curved Ramps: How They Actually Differ
Both styles do the same basic job — raise one or more tires so the RV’s chassis sits level — but they get there in different ways, and that difference matters more than brand loyalty.
Interlocking stack blocks are individual pieces, usually shaped like a stop sign or octagon, that lock together with raised pegs and matching sockets on the top and bottom faces. You drive the tire partway up a short ramp built into the top block, then build a pyramid or straight stack underneath to reach the height you need. Because each block is a known thickness (typically 1.5 to 2 inches), you can dial in almost any correction in predictable steps, which is why stack blocks are the standard choice for tandem-axle and triple-axle trailers where one side of the rig needs several inches more lift than the other.
Curved ramp levelers are a single molded piece with a curved track. You drive the tire up the curve until a built-in bubble level reads level, then drop a wheel chock behind the tire to hold position. There’s no stacking and no assembly, which makes them faster for the common case — a single-axle travel trailer or a motorhome that’s off level by an inch or two on one side. Their tradeoff is a lower maximum correction, usually 4 to 4.5 inches in one pass, and they only level along the axis the ramp is pointed, so a rig that’s uneven in two directions may still need a block or two under the tongue jack or rear stabilizers.
Weight ratings are listed as GVWR (gross vehicle weight rating) support per set, not per block, and they range from about 20,000 lb for entry kits up to 35,000 lb for heavy-duty stack blocks aimed at fifth wheels and toy haulers. Buy based on your trailer’s fully loaded weight — water tanks full, gear packed, propane on — not the empty dry weight printed on the window sticker, since that’s frequently 1,500 to 2,500 lb lighter than what you’re actually towing.
The Best Leveling Blocks Worth Buying
Camco FasTen Leveling Blocks (10-Pack) — approx. $44.99
Camco’s FasTen blocks are the best-selling interlocking kit on the market, and for good reason: the peg-and-socket interlock is tight, the orange ABS plastic holds up in high heat, and the kit includes a carry bag and a wheel chock. Each block is rated to support a share of a 30,000 lb GVWR set when properly stacked in a pyramid.
Best for: Tandem-axle travel trailers that need a reliable, widely available stack-block kit.
Andersen Camper Leveler — approx. $139.99
The Andersen is a three-piece curved ramp system: two ramps plus a rubber-toothed chock that locks the tire in place without needing a separate wheel chock. It corrects up to 4.5 inches in a single drive-on motion and is rated for 30,000 lb GVWR. It’s the most expensive option here, but the single-motion setup is genuinely faster than stacking blocks by hand.
Best for: Single-axle trailers and motorhomes where speed of setup matters more than maximum correction height.
Tri-Lynx Levelers — approx. $109.99
Tri-Lynx uses a similar curved-ramp concept to Andersen but adds fold-out support legs so the ramp stands on its own before you drive onto it, which makes solo setup easier. It’s rated for 20,000 lb GVWR and corrects up to about 4 inches per side.
Best for: Solo campers who want a self-standing ramp instead of chasing a block kit into position.
Lynx Levelers (10-Pack) — approx. $39.99
The original interlocking stack block, Lynx blocks use the same stop-sign shape and peg interlock as Camco’s FasTen line at a slightly lower price point, rated to 20,000 lb GVWR. They’re a safe budget pick if you don’t need the higher rating of the heavy-duty kits below.
Best for: Budget-conscious owners of lighter travel trailers and pop-up campers.
Valterra Leveler Blocks with Slide-Lok (10-Pack) — approx. $32.99
Valterra’s blocks add a locking tab on each interlock point specifically to stop blocks from creeping apart under load on uneven or soft ground, a known failure mode with cheaper interlocking kits. Rated for 20,000 lb GVWR.
Best for: Gravel and dirt sites where lateral creep is a real risk.
Camco Yellow Heavy Duty Levelers (10-Pack) — approx. $54.99
A thicker, wider version of Camco’s standard block with a 35,000 lb GVWR rating, aimed squarely at fifth wheels and toy haulers that are too heavy for standard-duty kits. If you’ve bent or cracked lighter blocks under a loaded fifth wheel, this is the upgrade.
Best for: Fifth wheels, toy haulers, and any rig pushing toward the top of the weight range.
Homeon Wheels RV Leveling Blocks (10-Pack) — approx. $27.99
The budget entry in this roundup, Homeon Wheels blocks use the same basic interlocking geometry as the name brands at a noticeably lower price, rated to 20,000 lb GVWR. Build quality and interlock tightness are a step below Camco or Lynx, but for occasional campers who level a couple of times a season, it’s a reasonable way to save $15–20.
Best for: Occasional campers who want a functional kit without paying name-brand pricing.
Weight Capacity Compared
Max Recommended Lift Height Compared
Spec Comparison at a Glance
| Product | Style | Approx. Price | Weight Rating | Max Correction |
|---|---|---|---|---|
| Camco FasTen (10-pack) | Interlocking blocks | $44.99 | 30,000 lb | ~8.75 in stacked |
| Andersen Camper Leveler | Curved ramp | $139.99 | 30,000 lb | 4.5 in single pass |
| Tri-Lynx Levelers | Curved ramp | $109.99 | 20,000 lb | 4 in single pass |
| Lynx Levelers (10-pack) | Interlocking blocks | $39.99 | 20,000 lb | ~7.5 in stacked |
| Valterra Slide-Lok (10-pack) | Interlocking blocks | $32.99 | 20,000 lb | ~7.5 in stacked |
| Camco Yellow HD (10-pack) | Interlocking blocks | $54.99 | 35,000 lb | ~10 in stacked |
| Homeon Wheels (10-pack) | Interlocking blocks | $27.99 | 20,000 lb | ~7.5 in stacked |
Getting the Full Setup Right
Leveling blocks only solve elevation. Once your tires are up on blocks, the trailer can still roll if the parking brake isn’t fully engaged or the ground is soft, which is exactly why you should pair leveling blocks with wheel chocks for a fully stable setup — see our guide to the best camper wheel chocks for how to size and place them correctly once your tires are on blocks.
Leveling and stabilizing are also two different jobs. Blocks and ramps get the chassis level side-to-side and front-to-back; stabilizing jacks at the corners of the frame stop the rig from bouncing when someone walks inside. If you haven’t compared the two, our breakdown of the best scissor jacks covers why RV stabilizing jacks and emergency roadside scissor jacks are built for completely different loads.
For heavier fifth wheels that regularly need extra support under the frame during long stays, it’s also worth keeping a set of rated jack stands on hand rather than relying on the trailer’s built-in jacks alone — see our guide to 10-ton jack stands for commercial-grade options built for RV and trailer axle weights.
And if leveling and towing setup go hand in hand for you, don’t overlook the in-cab side of the equation — a properly matched electric brake controller makes the actual towing and backing-into-a-site process that gets you to level ground in the first place noticeably easier to control.
Frequently Asked Questions
How many leveling blocks do I actually need?
Most tandem-axle trailers need one full 10-block set per axle side that requires correction, since a stable pyramid stack for anything over 4-5 inches typically uses 6-10 blocks. Keep at least one full kit in the trailer at all times rather than splitting a single set across both sides.
Are curved ramps or stack blocks safer?
Both are safe when used within their rated weight and height limits. Stack blocks carry more risk of a pyramid shifting if built incorrectly or set on soft ground, while curved ramps carry more risk if you exceed the single-pass height limit by trying to drive up too steep an angle. Follow the manufacturer’s stacking diagram and never exceed the rated correction height.
Can I use leveling blocks on dirt or grass instead of pavement?
Yes, but soft ground increases the chance of blocks sinking unevenly or creeping apart under load. On dirt or grass, use a flat backing board or dedicated base pad under the blocks and choose a kit like the Valterra Slide-Lok that locks the interlock points together.
Do I need leveling blocks if my RV has automatic hydraulic levelers?
Automatic hydraulic systems handle most of the leveling job on motorhomes and higher-end fifth wheels, but a basic block set is still worth carrying as a backup for hydraulic failures and for getting the initial approach angle right before the system engages.
What’s the difference between leveling blocks and wheel chocks?
Leveling blocks raise a tire to correct unevenness; wheel chocks wedge against a tire to prevent rolling once you’re parked, whether or not you’ve used leveling blocks. They’re complementary, not interchangeable — most experienced RVers carry both.
The Bottom Line
For most tandem-axle travel trailers, a 10-pack of interlocking blocks like the Camco FasTen or Lynx Levelers is the more versatile buy, since you can build exactly the height you need and reuse the same set across different campsites. If you’re mostly dealing with small corrections on a single-axle trailer or motorhome and want the fastest possible setup, a curved ramp system like the Andersen Camper Leveler is worth the higher price. Whichever style you choose, match the weight rating to your fully loaded trailer weight, not the dry weight on the sticker, and pair the blocks with a proper set of wheel chocks so the rig can’t creep once it’s level.
