Classic Accessories OverDrive PermaPRO Deluxe R-Pod Cover, Fits up to 20' long Trailers - Lightweight Ripstop Fabric with RV Cover (80-257-171001-00) Extra strength, lightweight PermaPRO ripstop fabric repels water and protects against dirt and sun damage. Air vent system and quick drying PermaPRO fabric combine to reduce wind stress and vent inside moisture. Adjustable front and rear tension panels and elasticized hem corners provide a custom fit. Tension panels reduce cover stress when tightening the straps. Zippered panels allow access to the RV doors and storage compartments. Long zipper pulls reduce the need for a ladder.