On my Challenger I also have 2 gray tanks and one black. Everything on the passenger's side (shower, outdoor kitchen sink and washing machine drain) dump into the rear gray tank. Everything on the driver's side (kitchen and bathroom sink) dump into the forward gray tank. The toilet is the only thing that dumps into my black tank.
I had the same issue where neither the Thor regional sales rep nor my dealer could tell me how the tanks were plumbed. I figured it out by running a fixture and then dumping a tank. I repeated this until I knew which tank each fixture dumped into. This was later confirmed after I received the waste water diagrams from Thor.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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