For a 20 foot long 2008 Flagstaff 620ST pop-up camper I recommend using the Classic Accessories Deluxe PolyPro III Heavy-Duty Pop-Up Camper Cover - 18' - 20' Long # CA80043, which is designed for pups that are 18-20 feet long. This will also work with the AC unit you've got on top of the trailer, so there's nothing to worry about in that respect. I really like this cover because it's made of a heavy duty polypropylene, which will help repel the elements including rain, snow and dust.
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