Originally posted by 59toaster
Ours doesn't have a grey water but the plan is to add one. To furth complicate issues our balck water is above the floor. Our gray water will be below so I either have to keep the drains seperate before the slinky or I have to work something else out.
My Scamp 5th-wheel had separate drains for the black water and the gray water. The black water drain was in front of the single axle and the gray water drain was just behind the axle. By positioning carefully, I could reach both without moving the trailer.
I never felt that the separate drains were any problem. I would dump the black tank first, then move the hose to the gray outlet. This layout served me well for years. If I were to add a gray tank to an existing trailer, I would certainly consider separate outlets.