I don't recommend covers for anything if you are in a windy area. I used to cover our stuff and the wind would make the covers move and rub through everything. Keep it clean, waxed and uncovered and I think you will be just fine. I use a windshield screen to keep the sun off the interior now and that is all I use.
Shane, Ann, and Sebastian
2007 Volvo VNL 780 "Vlad"
2008 Dutchmen Grand Junction 34 QRL