Check the exterior of the rear wall, where the FILON meets the bottom coroplast. Many times there is a "DARCO wrapped fold" that is stapled to the bottom of the rear wall braces. Sometimes water will run down the rear wall, hit the bottom molding and instead of running off the wall, it will wick under the bottom and seep into the coroplast. It never gets "inside the trailer" and isn't exposed to any of the structure, it's just "there".... Sometimes, you can add some screws with washers to pull the DARCO up so water doesn't run down it. Other times, just raising the front of the trailer an inch will stop the wicking.
Sort of like holding a water hose in your hand, some water leaks down the nozzle, drips onto your fingers and before you notice it, your shirt sleeve is wet. Your elbow is always safe, so no real problem, just a "part of using the hose"....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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