PolyPRO™ 1 5th Wheel RV Cover gray 33-37 ft. Light but strong, PolyPRO™ 1 fabric repels water and won't scratch your paint. It protects against dirt and scratches, and is perfect for storage and moderate weather protection. Custom-fit the cover to your 5th wheel with the elasticized bottom corners. Mildew resistant and easy to set up, this cover is a great, lean option for protecting your investments! A storage bag and tie-down rope are included.