I have 2 sewer connections on my Challenger. As gmc stated I use 2 10 foot hoses connected into a Y and then either 10 or 20 foot hose to run from the Y to the sewer hookup. I have 2 grey tanks and a black so I will keep the black valve closed and the grey valves open until it is time to dump the black tank.
You might want to verify the 4 tanks. Usually there will be a grey, black and a combination grey/black on bath and a half units. Maybe someone on the forum that has the same model coach can shed some light on the topic.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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