Auto finishes are heavily researched, and tested for UV resistance. They are also clear coated. In addition, many cars are garaged, waxed in an hour or two, etc. An RV often sits out, parked with the same side exposed to sun and weather. Many RVs also extensively use vinyl decals, that aren't well suited to long exposure.
Comparing an RV finish to an auto isn't fair. A cover might extend the life of the finish, but could also suffer abrasion from a cover's movement over time.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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