So, spent the better part of this morning installing a flush valve in my black tank.
Tornado Permanent Tank Rinser with Remote Connection - Camco 40126 - Sewer Flushing - Camping World
Not the optimal placement, but it was the only spot I could get to with the drill, and that's after buying a 90 degree converter. Valve is in and sealed, now I have to decide how to fun the 4 foot hose. I was thinking about running it right along the black tank dump pipe, right into the dump bay, and mount it underneath the dump valve. That would entail drilling a hole in the bay wall to run the hose through. Since the valve location is right in the rear, left corner of the MH....I was also thinking about just having the hose secured nicely, but with enough slack I could just reach up and pull it down a bit, and connect the flush hose...then just stuff it back up....maybe a nice hook right up under the back of the bumper.