Camco FasTen 44515 RV Leveling Blocks | Set of 10

Nobody sleeps well in a camper that's leaning, and your fridge doesn't love it either. The Camco FasTen 44515 set is the fix most RVers reach for first, a stack of ten yellow interlocking blocks that build up under your tires until the rig sits flat. You drive up onto them, chock the wheels, and you're done. No jacks to crank, no math, no guessing.

The trick with these is the interlock. Each block keys into the one below it, so a stack of two, three, or four doesn't slide apart when a loaded axle rolls up onto it. You build a short ramp with a couple of blocks leading up to a flat top, then pull forward until your level tells you to stop. Set the parking brake, drop your chocks, and the trailer holds. For most travel trailers and small fifth wheels, two or three blocks under the low side gets you level on a typical site.

The T-handle is the part people end up liking most. Twist it and it locks the whole stack together so nothing wanders while you're maneuvering. Pull it up and it's a carry handle, so you can grab a full stack in one hand and walk it back to the storage bay. Ten blocks in the set is enough for one side of a single-axle trailer to get a real lift, or to split across both sides of a tandem for smaller corrections.

A couple of things we tell folks at the counter. On soft ground, gravel, or grass, lay a scrap of plywood or a leveling pad under the bottom blocks so the stack has a solid base and doesn't sink or shift. Seat every layer fully and give the handle a twist before you drive up, because a block that isn't locked in can kick out when the tire loads it. And these are for leveling, not chocking. Always back them up with wheel chocks once you're parked. Plastic under a tire on a slope will let the rig creep if you skip the chocks.

How high can you go? You can stack these several blocks tall, but the taller you build, the more important a wide, solid base becomes. Two or three blocks handles the vast majority of campsites. If you're routinely needing four or more under one side, that's a sign the site is rough enough that you'll want that plywood base underneath and maybe a longer ramp of blocks so the tire climbs gradually instead of dropping off an edge.

They work under travel trailers, fifth wheels, pop-ups, truck campers, and van conversions, anywhere you'd otherwise be stacking scrap 2x6s or fighting with a bottle jack. They're also handy under stabilizer jacks and tongue jacks when the ground is lower than the foot can comfortably reach. Because they nest and interlock, the whole set packs down flat and stores in a bag or a bin without rolling around your basement.

The blocks are molded from heavy plastic that shrugs off water, road salt, and the weight of a loaded camper. Yellow, so you can actually find them at dusk and won't drive off leaving one behind. They won't rot like wood, they won't rust, and a quick rinse cleans off the mud. Over years in the sun the color can fade, but the block keeps doing its job.

One more thing worth knowing. Ten blocks split nicely for a tandem-axle trailer, where you often need only a small correction spread under two tires per side. For a big single-axle load that needs real height on one corner, you may find yourself using most of the set on that one side, which is exactly why the ten-pack exists.

For the money, a set of FasTen blocks is one of those buys you make once and use every single trip. Toss them in the truck, and you'll never park crooked again. If you camp on rough or unlevel sites a lot, the ten-pack gives you enough height to handle the bad spots.