http://rvsnappad.com/collections/snappad/products/new-snappad-xtra?variant=23711565827&gclid=CJOSiPqytdACFUtufgod_UwLVg anyone bought these and used them yet look pretty neat and effective
My pads were three layers of 5/8 plywood, 24" square. Original use was on blacktop driveway to spread the load. I have used them on grassy sites and they flat out did not sink in. They are now however getting a bit 'funky'. They will be replaced with 12" square 2" thick rubber pads.
While on the subject, get a pair of wheel chocks. Sort of a 'belt and suspenders' approach.