Just to add, it’s quite possible that the black tank vent is not connected at the top of the tank. How many black tanks does it have? Sitting in storage that long without water and treatment along with a vent line not connected would be smelly!! Drop the Coroplast in the area of the black tank and check it.
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Mike & Anita
2017 3921FB, MoRyde LRE4100, Xfactor, Pin Box, Titan Disc Brakes
2016 RAM 3500 DRW, Cummins
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