Personally, I think that the overly priced covers designed for rvs are not made to last more than a couple of seasons. I live in upstate NY and have pretty severe winters. For the past 5 years I have used the same 20' x 40' heavyweight tarp that I purchased at a farm supply store for under $150. I do have to tie it down very tightly and secure the loose areas on the corner. When I am done wrapping it it looks like a gift. Best way I can describe.
I do not get mold and moisture in the rv. I always leave a Window or two cracked and leave all roof vents partially open so the cabin can breat. (my roof vents have covers).
Steve
