Every time I set up on grass or gravel I found the blocks for the front jacks and the rear stabilizers as well as the wood under the tires to be filthy when breaking down. I'd end up scraping or scrubbing the mud/gravel off of the bottom sides. I once used the plastic Wal*Mart bags under the blockage but if there was the least bit of a breeze the bags blew away before I could set the blocks on them.
I found the perfect solution.
Dinner Table Placemats
When we were going through my father-in-laws estate I found about 2 dozen plastic place mats and my brain started working. I use the full size mats under the front jack blockage as well as the blockage under the tires. I cut the mat in half If I am only using the rear satbilizers without blockage.
When we pull out we merely deposit the used mats in the trash bag or the CGs dumpster.
Replacement dinner mats can be found at many a yard or gargage sale for next to nothing in cost. I have even found them in the yard/garage sales Freebie box.