The UnitedCovers 5-Layer is a heavy-duty, all-season storage cover engineered specifically for large fifth wheel trailers from 37 to 41 feet in length. Its layered fabric construction blocks UV rays, rain, snow, hail, tree sap, and bird droppings while a breathable micro-porous film lets trapped moisture vapor escape -- preventing mildew and rot during long-term storage. Zippered access panels, adjustable buckle straps, and elasticized hems mean this cover stays put and lets you get inside without a full removal every time.
Fifth wheels in the 37-41 foot class are significant investments that spend months parked between trips. A cover that lets moisture build up, sags in crosswinds, or tears on a ladder edge can cause more damage than parking uncovered. The UnitedCovers 5-Layer addresses each of those failure points with a purpose-built multi-layer design, reinforced stress points, and practical access features that make daily use realistic -- not just seasonal pull-on storage.
The cover ships in a zippered storage bag and includes a patch kit, so minor field repairs do not sideline your protection. At 25 lbs, it is manageable for a two-person installation on a large rig. Overall cover dimensions are 41.5 ft length x 8.58 ft width x 10.08 ft height, providing enough clearance for slide-out overhangs and up to three rooftop AC units.
UV-resistant polypropylene layers with a micro-porous film core block sun, rain, snow, and hail from the roof down -- where weather hits hardest.
Triple-layer side fabric resists crosswind debris and side-angle sun exposure while remaining lightweight enough for manageable installation.
Access entry doors and exterior compartments without removing the entire cover. Practical for seasonal storage where periodic interior checks are needed.
Cover height and roof profile accommodate up to three rooftop air conditioning units without creating pressure points or stress tears.
The top section uses five bonded layers: outer UV-resistant polypropylene, a micro-porous breathable film, and additional reinforcing plies. This construction blocks over 98% of airborne dirt and dust from reaching painted surfaces while allowing water vapor to escape -- critical for preventing the trapped-moisture mildew cycle that damages sidewalls and roofs during multi-month storage.
Side panels use three-layer construction focused on lateral weather resistance. The extended top layer drops further down the sides than a standard single-layer top, providing runoff coverage against rain and sun reflection on the upper sidewalls.
Elasticized hems at the front and rear corners pull the cover snug against the fifth wheel pin box end and rear cap, reducing shifting during wind events and preventing corner flapping that causes abrasion to graphics and clearcoat. Adjustable buckle straps with weighted ends cinch down the mid-sections to eliminate billowing, which is the primary cause of premature fabric fatigue on long covers.
Reflective panel strips along the sides improve visibility of the parked rig in low-light conditions -- useful in campground rows, storage lots, and residential driveways where foot and vehicle traffic passes the parked unit after dark.
You can wash the cover by hand or in a washing machine. For hand washing, install the cover on your RV, rinse it with a hose, then use a cloth and multi-purpose cleaner to scrub. Rinse again and either towel dry or let it air dry.
For machine washing, use the largest machine available, set it to gentle mode, and wash with mild powder detergent in cold water—avoid bleach and fabric softeners. Rinse the cover twice to remove all detergent, and always air dry.