I saw a video out there somewhere of a couple installing a cover on a Casita. It was not pretty. They had long handles made from PVC (which will have to be stored somewhere) and were not having a good time.
I have used car covers for years on my Street Rods, but would never think of covering my trailer long term outside. Wind will tear the cover and cause chaffing on the trailer surface. If you want to remove the cover and it happens to be wet, well, that's another whole story. A wet car cover is not nice to deal with, I can't imagine dealing with a wet trailer cover.
Not my "cup of tea".