The coroplast can collect water thrown up while driving in rain. Drill a small hole at the lowest point and collect the liquid in a bucket. Examine what comes out and you'll quickly determine if its sewage or grey water. If its clean and all drains out and doesn't refill until you pressurize your water system, then it's a fresh water leak.
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2016 Montana 3711FL
2005 Ford F350, 6.0 diesel, short bed
Demco Hitchiker Auto Slide hitch
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