Jerry-
Hello, from a fellow "Mountaineer!" I don't live there now, but my parents did when I was born. Last time I was in WV was in the late 1970s. At that time, the winding hillside roads struck me as the only place I'd driven where the posted speed limit was too high!
Here are the results of a Google search of posts on iRV2 that contain the terms "Monaco" "black" "tank" and "rinse."
I read through a number of posts a while ago on this, and it seems as if they contained ideas on how to unplug the rinse tubing. There's probably an answer in there on access as well.
Sorry I can't help with personal experience- hasn't happened to me yet.