A few years ago I had a trailer and put a cover on it and the cover rubbed a hole in the rubber roof along the top edge of the trailer where the roof meets the siding. Is there a good way to stop this...
I would guess you didn't have the cover tight enough.
As said above, my cover blows a bit in the wind, but the edges of the cover never shift. It's more like the cover puff's up, but never changes location on the trailer.
I'd say mine is tight enough that its a struggle to open a window more then 6" out from the trailer wall.