The Classic Deluxe PolyPro III Class C RV Cover mentioned in my post above has worked out well.
It's a bit too big but it has stayed on all winter with no problems. I criss crossed some elastic cord under the RV to secure it.
I can access the side RV door or the Chevy doors. I tend to enter through the Chevy door because it happens to be easier (less things to undo).
I'm surprised how clean the cover still is. It doesn't get much sun and it does get lots of tree debris so I expected moss...........