I agree, they rub on your roof radius and can put holes in it, not to mention at the most I would get three years max out of all my covers. I would get a cover for the ac and raise the front up so the roof will drain if you are in snow country. In my opinion the summers are much worse on an rv that the winter is.
2018 North Point 315 Rlts
2020 GMC 3500HD CCSRWLB
2016 Gmc 3500 Denali SRW Dmax
CURT FACTORY ball with the Andersen hitch