IMO, no need if the surface is well-drained, e.g. the rock already mentioned, dry sand, etc. Or dry, well-cured concrete either. Many norther US soils, though, have fairly high clay or similar content that doesn't drain worth a darn.
If you put something between tires and the surface, make sure that "something" doesn't have nasty chemicals in it, e.g. some pressure treated woods, creosote, asphalt shingles, etc.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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