BTW.... if you end up using pads, blocks, lumber, etc they tend to get muddy when it is muddy. Nasty...
Purchase one 3/4" horse stall pad that is perforated (rubber).
Cut into 1 square foot pieces and put on ground under all those pads (too much work, really). You can get 9 pads, or just cut the four you need and make a floor mat out of the remainder. The mud shakes right off. I've made floor mats and generator mats out of them.
When you are ready to leave, the mud chunks easily shake out of the perforation holes and your pads, blocks, lumber, etc stay clean.
Tractor supply used to keep them in stock, but sometimes you have to order them.