I notice most of the posters on this thread are from the eastern half of the US. Well us living all lives in Penna. until 11 years ago and now wintering in Yuma, AZ. Covers out here last approx. 3 months during the summer months. New folks leaving their fivers or TT's think covering is the cat's meow. Seasoned vets tell them, "don't bother". Saw one guy buy a high end cover for his Montana. I came back in the fall and it was shredded, wrapped around different parts of the trailer. I asked the manager who stays there all year how long it was in one piece. He said "it did make it from April-August in one piece, but then the brilliant sun and wind took it's toll. It now sits there year round uncovered and looks no worse for the wear. Also, when the winds blow and the dust works it's way under the covers, 3M would be happy to have sandpaper work that good.