Jon is right on with this one. I say 2 coaches at my local dealer that had the rubber roof wore thin on the two back corners because the cover was blowing around in the wind. Tech said both covers were put on properly, and the covers even had weights to hold them down. That said, I am sure there are owners that have used covers for years with no problems, and may be able to offer you advise on using a cover. We winterized and stored our coach outside for 7 WI winters. When spring arrived I got out the cleaning equipment and did a complete scrubbing, top to bottom. Never had any damage caused by winter storms or weather. Good luck.