If you search around the internet you'll find plenty of folks that don't buy a cover or bought a cover and it was such a hassle they stopped using it.
I suppose there are times when a cover could be a good idea - but they are difficult to handle. They do some damage on their own with rubbing on painted parts in wind. They can trap moisture. Break Antenna. And keep you from visiting the RV in the off season to exercise the engine and generator every month or so.
You can tell what side of this subject I reside - perhaps others will feel differently and chime in.
Here's a thread on sister website
www.irv2.com which has a larger audience on this same topic.
https://www.irv2.com/forums/f52/rv-c...no-470587.html