Re: Wheel Wells not protected from moisture
I check mine every trip. The DARCO (polyethelene reinforced "fabric" sheeting) that's used in the wheelwells is an "industry standard" and found on almost all "entry level", "mid level" and most "luxury level" trailers along with almost all fifth wheels, except the very upper "luxury models". It's used because it's "fairly durable", waterproof, doesn't decay and will last an extremely long time (unless damaged). All Keystone products (to the best of my knowledge) use DARCO in the wheelwells and as a "belly cover" on all trailers that don't have Coroplast as a belly cover.
While it's durable, it can be damaged. Spraying automotive undercoating is one solution, although I don't now how long it will last to seal the wood if there's a hole in the DARCO. Once the undercoating pulls away from the edges of the hole, it's "wide open" again... There is a repair kit available, although most people use Gorilla Tape after cleaning the DARCO well and wiping down with alcohol. Once that dries, the Gorilla Tape will adhere "almost permanently" to the DARCO.
While there are more durable materials, tin sheeting, old PU truckbed liners, etc, they add significant weight and won't protect from a blowout, so they don't offer much more protection than the DARCO.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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