We have a 29' class C, bought an ADCO cover for it, biggest waste of money yet.
Even though the straps were tightened, when the wind blew, it wore holes in the cover, everywhere it touched, the toggle levers for the awning, slide toppers, & any corner, had to remove the drip extensions, all in all, a Major PITA to put on & take off.
When I took it off this spring, it got wadded into a bundle & tossed into a dumpster.
I have ordered a 20X41X12 metal RV/car port.