Single black/gray drain outlet
Our last tt (2016 crossroads zinger) had two separate gray tanks with two separate drains..so, at dump station, it would be - connect / drain/ disconnect, and then do it again at the second drain.. al...
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Not sure I understand how your black tank can back up into your shower, they all have separate valves that close them off. And if your parked and they all are open and they back up, well there is a bigger problem.
Had a Cougar with 2 gray and one black tank, and a single drain point, worked great. Sold it last fall and was looking for a new trailer this month. Found a floor plan that we liked but had 2 separate drain points for the sewer. NO good in my opinion, we went with a different trailer.
Reason: I really don't like messing around with sewer hoses, so the less hose the easier, that is what works for me.
Tinbender
Had a Cougar with 2 gray and one black tank, and a single drain point, worked great. Sold it last fall and was looking for a new trailer this month. Found a floor plan that we liked but had 2 separate drain points for the sewer. NO good in my opinion, we went with a different trailer.
Reason: I really don't like messing around with sewer hoses, so the less hose the easier, that is what works for me.
Tinbender
