I had a cover on my 5th wheel for about 4 years. If you put them on nice and snug the wind didn’t affect it at all. It also kept it dry during the rainy months. It was as clean as it was the day I covered it. Make sure it’s dry when you cover it up. They are right about it being a pain to put on and off. I have seen some that cover just the roof don’t know much about those.
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