I live in Arizona, and the sun does do some damage to the RV. Especially things like plastic parts and decals. I tried covering mine, but I found it was just too dangerous trying to crawl up on top of the RV, drag the cover and then unfold it while not falling off the edge of the rig. Then, it's a hassle to uncover it if you just want to take off for a day or two. It's easier to be spontaneous and head out if it's not covered. My personal choice is to just deal with the sun, and leave the RV uncovered.
