I know this post will become toxic quickly with both those for and against covers. That being said, I do use a cover during the winter. We bought a Calmark cover while living in Alaska for the Monty. It is 7 years old now and looks great. It is heavy, and I mean HEAVY, but fits well. Measuring correctly is the key. I have not had any issue with wind marring the finish. Maybe you do get what you pay for.
https://calmarkcovers.com/custom-cov...trailer-cover/