I used an Adco cover from Camping World for a couple years. It was not real expensive and lasted the two years I needed it. I paid an extra $90 for extended warranty and after two years, I returned it to CW for a new cover and sold the new one for 3/4 the price I paid for it originally.
If you do use a cover, take care to pad all the protruding items like vents, ladder, awning ends etc.
Dennis & Carol
2003, 4006, 41' DutchStar,
Spartan, ISC 8.3L W/BanksPower - 2013 Honda CRV, BlueOx Baseplate, Aventa Bar & Patriot Brake. And the 04 Bird, Sunshine Car.