Converting Black Tank into a Grey Tank Overflow?

[davidbrady]

As another point of reference, in the Prevost converter world both Parliament and Liberty Coach have only one holding tank, both grey and black flow to the one tank. They have a grey water bypass in case you're in an environmentally friendly area which permits dumping of grey water to ground. Folks love this setup. The advantage is clear: you can use your tank to near 100% of capacity before pulling up roots to find a dump station. Frankly, I think the dual holding tank notion is an anachronism carried over from the days when it was largely permitted to freely dump grey to ground. Thoughts?