[Phil Saran]

Maybe I'm just cheap (thrifty?), but what I use for leveling my 5th wheel
side to side is a set of two 2" x 8" X 5 foot boards.

I first back or pull into the space, use a level to check side to side and then
place one or both boards down on the side needing the lift and then back
up on the boards.

I use a couple sections of 8" x 8" beam for under each front leg of the 5er.

I also have a set of the Legos, but only use them for the rear stabilizers.