I say replace or remove (numerous posts on how to do this) the black tank check valve. The leakage runs down the Pex lines into the belly and likely is the source of the puddle.
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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