Ive not had any problems with mine but wind is not an issue here. I bought the Goldline Class C cover - see below. They're pricey but it's been worth it so far.
Good luck.
Goldline Class C RV Covers
*Exclusive solution dyed 100% woven marine grade polyester
*Expert patterning
*Elasticized front & rear hems keep cover in place
*Includes a matching storage bag
*4 - 40' Heavy duty hold down straps included
*Reinforcement kit included for extra protection against damage from sharp area and stress points
*3 Heavy duty acess zippers on passenger side
*5-year Warranty