Check into the routing of the drain pipes from the sink and if your handy I bet it could be re-routed to the gray tank. I know that setup would not work in my camper as my wife uses a lot of water doing dishes and that going into the black tank would cause an issue real fast. Your right that is a crazy setup...
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2008 Silverado 3500HD 4x4 SRW Duramax Allison trans
2014 Cougar 327 RES "Campy"
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