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
I use some pads I cut from a sheet of a product called Fin Form. It's a laminated plywood that we used if the Fire Service for trench shoring during rescues. It's about $100 for a 4x8 sheet. I went to a company called United Rentals and they had some partial sheets that had been broken and gave them to me.