we bought a well known branded cover for our van last year,this was due to the fact that the van was stored under trees and we wanted to keep it as protected as possible.We had smaller protection covers included, 4 in total for the rounded edges which fit into the awning rail,also a hitch cover.I think I paid
I have one of the cheaper covers & have used it for the last two winters I do cover the windows with some old sheets just in case, but I have not had any damage to the van at all. I do wash & polish the van before putting the cover on though