How To Level A Travel Trailer Side To Side

Side to side is the leveling job that goes wrong, because you cannot adjust it afterward and there is no obvious way to know how much lift you need before you commit.

Estimating the lift before you build

A travel trailer has roughly 6–8 ft between the tire centers across its width. Over 7 ft, one degree of slope is about 1.5 in of height difference. So:

Most phone level apps read in degrees, which makes this easy. Set the phone on the trailer step or a frame rail across the width, read the number, look it up.

Round up rather than down, and over-build by half a block if you are unsure — you can always drive a little less far up a stack, and you cannot add a layer once the tire is on it.

Tandem axles: support both wheels

This is the mistake that matters. A tandem-axle trailer has two axles joined through an equalizer. If you raise one wheel of the pair onto blocks and leave the other on the ground, three things happen: the equalizer rotates to its limit, load shifts heavily onto one axle, and the suspension is held in a twisted position for as long as you are parked.

So the lift has to be long enough for both tires. A long block ramp, two stacks butted together, or two curved levelers — whatever gets both wheels on that side supported at the same height.

The drive-up

1. 1

   Place the lift tight against the tires

   Butted up against the tread, on a grip mat if the surface is paved or hardpacked. A gap means the trailer rolls before it climbs, and a stack can get pushed rather than climbed.
2. 2

   Pull forward or reverse up, slowly

   Idle speed. Blocks and ramps both want a slow, steady climb — speed carries you past level on a ramp and shears a block stack.
3. 3

   Have someone watch the level, or watch a phone

   On a ramp you stop when it reads level. On blocks you drive fully onto the stack, then check.
4. 4

   Chock immediately

   A trailer sitting on a ramp wants to roll back down the curve, and a trailer on blocks is higher than its chocks were designed for. Use the ramp’s own chock, or a taller block-style chock.
5. 5

   Re-check before unhitching

   Level the width again. If it is close, move on to chocking and unhitching. If it is a layer out, now is the moment to fix it — the truck is still attached.

Cross-slope: the slope across the width of the site, which is what you fix with blocks under the tires. Longitudinal slope — along the length — is what the tongue jack is for, and you can fix that after unhitching.

When to move instead of building higher

Most block makers cap stacking at around four layers and there is a good reason: a tall stack has a small footprint and a high center of load, and it fails sideways as the tire climbs. Past four inches of required lift, the right answer is almost always a different part of the site.

A site that needs more than that is also likely to leave your door at an awkward height and your tongue jack out of travel. Walking twenty feet to a flatter patch is cheaper than every workaround.