I use simple, 3/4" pressure treated plywood under my Vegas by my pool. Cheap, cost effective. One sheet cut into 4 pieces, 2 long narrow for fronts and 2 wider for rear dually. They take a set (bend) and I flip them when I take unit out.
Keeps it fron sinking with no issue, even after 12" rain in 72 hours we had a few weeks back.
I got a 30 AMP off main to keep interior at 82 degrees. Amazing how cool inside of RV feels when it is in 90's out.
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