100 percent agree that getting your camper under a roof is 100 percent better than leaving it exposed to the elements, especially intense heat and sun. If you can afford a covered storage facility, then do it.
Second best is a fabric RV cover. This may be a real headache putting on and taking off if you use your camper very much. But in the extreme elements or if parked under messy trees, covers are worth it.
Third best, (but you should do this anyway), is to keep the roof treated with RV conditioner at least once a year, more if you have the time.
One argument for having a dirty roof, opposed to those us of 'crazy people' who like to keep them spotless clean ... at least dirt puts a layer of protection between the sun's UV rays and the rubber the roof is covered with! So, if you live in Texas, because of the extreme sun, I suggest you never wash your roof if you can't keep it under a cover and hope acid rain doesn't dissolve the rubber.
