Sunbrella is an excellent fabric choice. I have used it in the Florida sun for Bimini Tops, Fly bridge covers and aft cockpit covers, continually exposed to the Florida sun and got about nine years out of the material. However, the stitching gives up about year three to four and it needs restitched occasionally. It is the Dacron thread that is not as hardy as the Sunbrella fabric, so I would imagine a large RV cover would suffer the same fate. Also, if you get one, the only protectant that Sunbrella recommends is Aerospace 303 for fabric. It just takes plenty of it and based on the size of our fifth wheels, about two gallons a year at about $65 a gallon wouldn't surprise me. As a side note, Sunbrella is a 9.3 oz fabric, so the cover will be heavy. It's not something I would want to put on and take off every time I wanted to go camping. Additionally, if you are in a windy area, the cover will most likely need very secure tie downs to prevent abrasion.
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