as already mentioned above ..... wood
a 2x6x8 piece of treated lumber sawed in 1 1/2 ft (give or take depending on your rig) will last a long time
we were given a set of the plastic levelers, have used them once.
it is more convenient to use the wood. I even take a couple longer pieces because one of the places we camp has a slight angle to the dirt and it is easier to keep everything in place pulling up on a longer piece of wood with 2 different sized stacks.
I know the wood is heavier but sometimes "old school" just seems to work better.
psssttt drcook = David R, not Dr. but thanks for the compliment. Most folks just call me Dave.
2004.5 Chevy Duramax crew cab 4x4
2010 Crossroads Cruiser 30QBX
1991 K2500 4x4 being restored