To rephrase - you are going to leave the dump valve for the black water (below the trailer) open, and the dump valve for the gray water (also below the trailer) open, so they can cross-communicate, as it were. Even if you close those two dump valves before dumping, it's going to be messy when you take the end cap off the dump line. There will be a gallon or so of mixed "stuff" down in the end of the dump line, constrained only by that cap, and it will spill on the ground when you pull off the cap.
There is a fair amount of toilet info in the TM Reference Library, aka TM Info You Won't Find Anywhere Else.
Bill
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