ADCO 52257 Designer Series SFS Aqua Shed 5th Wheel RV Cover - 37'1" - 40' ,Gray Length 37'1" - 40' (486" x 108" x 126") Protect your 5th Wheel with ADCO's Designer Series SFS AquaShed RV Cover. Triple layer SFS AquaShed top panel beads water contact. Two-tone designer polypropylene sides insure maximum breathability while virtually eliminating mold and mildew. Maximum resistance to high humidity and rainfall.