RV Covers

Lot's of pro's and con's when discussing RV covers, personally I like them because I feel it protects the RV finish from the suns UV and fading the furniture and cutains. Also, when I uncover the RV it looks nice and clean. My question is, where can I purchase a high quality RV cover for my 34 foot Sundance that will last more than one to two years? I purchased a ADCO cover and it didn't last a year without getting a hole in so they are off my list.
Thanks and be safe!