I use the EBay cover from elite motors. Around 130 bucks I think. Would rather own a Calmark cover, but at the time money was tight and price was a limiting factor.
The cover I own has served well thus far, does have a small tear from catching on bumper which was my fault. Western NY winters are brutal and think I've finally found a place for storage inside that I can trust. However, at some point the Calmark is on my bucket list.
There are also owners here who do not feel comfy with any cover for real concern that dirt and cover can rub and scratch FG. Unfortunately my cover was rather sloppy so at someone's suggestion I wrap nylon straps around belly of traer to keep it from flapping in wind so much. Cut off the buckle end if cheap ratcheting tie downs I bought at Home Depot.
My garage is too short and can't afford a carport yet either, so we does the best we can.
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Fiberglass RV