If you're just talking about keeping the tires out of contact from the dirt, you could use old auto floor mats. Go to a junk yard and buy what you need. Either lay in place and park on them, or park the rear wheels on the mats and use your leveling jacks to raise the front end up and slip the mats under the front wheels. If you use timbers under your jacks, you could keep the majority of the weight on them and reduce weight on the tires. Just don't raise rear wheels unless you have the front wheels blocked, your parking brake will be ineffective if you lift the rear wheels off the ground.
Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI