My suggestion is to use a good wax at least 2x per year. I use a product called "Rejex". It is a polymer that adheres to the gel coat after 12 hours and provides great UV protection. Put it on with an orbital polisher and wipe off with a microfiber towel. Takes very little to wax an RV (my 5th wheel is 43' and I only use 14 oz). This wax is used on planes and boats. I even use it on my truck. You can find it online under www.rejex.com
If you have a rubber roof make sure you treat it at least once a year.
Check your caulking constantly for any shrinkage and cracking.
If you perform the above procedures your rv will stand up to the harsh sun and weather.
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2013 Excel Wild Cargo -41GKE
2013 Chevrolet Silverado LTZ 3500HD Dually