I used to use Lego blocks for side-to-side leveling and 2x6 or 2x4 cribbing under the rear stabilizers. I'd lay 2 down side-by-side, then 2 crosswise, etc., to build up my stack as high as I need. Idea being that the less you have your stabilizers extended, the more stable you'll be. Now, with the 4-pt system on my KZ, I only use a couple legos under the front legs for a bigger footprint and have some 4" glue-lam scraps I put under my rear stabilizers for 1) footprint, 2) greater stability (less extension) and 3) rears have limited travel so I need them to keep from hitting the extension limit.
Lyle