I think covers really help protect the calking and the vinyl stripes. I had a Classic cover on our old MH and it held up well. I have an ADCO cover on our current rig and I like it better. It is easier to put on and looks much nicer. I live in north central Iowa and it is very windy here, I have never had one blow off or get serious damage from the wind. You do have to put them on properly and keep them fairly tight, also cover all sharp edges etc. I think they are just as important in hot sunny weather to protect the stripes etc. The stripes do not take UV rays very well. They are a pain to put on, but not too bad to take off. As mentioned above, on some RVs it is a good idea to put something on the roof to help shed snow as well as keep the cover from freezing down, especially if you plan to take it off in cold weather which I do as we like to go south in February or March. I had the old one freeze down to the roof once and that was a major pain. I wound up having to pile it on the roof and drive it to our heated shop to get it off.
