Happy Camper for us also. The shower drain problem sounds like what Rondo indicated. In the drain line below your shower is a HEPVO valve. That uses a membrane to stop oders just like a P trap uses water. If overflowing the tank reversed the membrane that could be your problem.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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