I started keeping the trailer covered about 2 years ago. That started when our then trailer, a 2009 Wilderness 26RKS, had been improperly built leaving out a 'bow' that connected the roof to the front cap. We, and actually no one else, had noticed the defect either, we later found out the part was not there and the rubber roof was just sitting there with goop and screws holding it but to nothing underneath. 2012, as I was getting it ready to go for the summer I found that over the winter water had gotten into that area of the roof to nose cap, frozen (we're in North Idaho) then as it thawed and melted the snow / rain flooded the cabinet over the bed and had run down through the wardrobe flooding the carpet in the bedroom. Some of the laminate on the cabinetry "ran" where water had sat there for a while. It did dry with no mold or frame damage just cosmetic damage and then we found out our extended warranty didn't cover roofing problems. We ultimately spent $1,100.00 to get the roof fixed, the missing bow installed but I wasn't going to chance that again and started using a cover. We had no other problems. Last fall we traded the Wilderness in on a 2015 Wildcat and we got one of the ADCO Tyvek covers for it. I know that none of the multitude of RV dealerships in the Coeur D'Alene and Spokane areas use covers, but I didn't want the hassle again. We are planning on putting up one of those metal RV covers, hopefully sooner than later or before we have to get a new cover, because I know the throw on covers don't last. We used to live in the Southern California desert and know all too well how the sun destroys interiors and exteriors!