I am dedicated to off-label use and reuse of various scrap I have around. This works for us quite well. The most expensive part is the "astroturf" door mat from a hardware store. It is 3/8 plywood, 2x4's, some nails and screws and, very important, those big paper clips. Without them the mat gets blown all over the campsite. It is stable and non-slip. The mat is easy shake clean or hose down if needed. If it had to be higher than these 6 inches, I would use two pieces of 2x4's in at least two corners, for better stability.