I'm on the other side, I've always owned a RV specific Adco breathable cover. The type you require is dependent on your region, and Adco or the CampingWorld website can guide you on this. In snowy areas with freeze/thaw cycles MANY folks find water damage in the spring. Folks who don't live in an area that receives 100+ inches of snow have no idea how harsh the winters are on the seals and openings of a coach.
Short story, we had record snow a few years ago that actually made the headers on large super slides bow and flattened axles. Think about 3500lbs of snow on your roof, if I have to shovel my stick built house with 2x6 rafters how do you think a 2"x2" RV truss with 1/2" plywood fairs?
Anyways, a properly installed cover is a good investment depending on your area, do not use a poly-tarp as they will create condensation and rub the finish on your trailer. Also, keep your roof vents closed and put a few buckets of Damprid in the trailer.
Edited by: mwebber78
2013 Jayco Eagle 334RBTS
Crossroads Forum Lurker