Real-life experience blocks to aid 6-point leveling system

We made 6 "pads" out of 12" square 3/4 inch thick marine grade plywood,2 pieces thick screwed together with deck screws. Painted them white. We've been using them almost 20 years so they're holding up very well. We use them under our 6 point hydraulic leveling legs every setup. Helps prevent settling on soft ground and doesn't leave rust stains on concrete pads. They ride, 3 to a side, in the truck bed in front of the hitch so it's easy to reach over the side to get them when setting up.