This might help someone, eventually:
I had a persistent dripping from the fuel tank, but it was fresh water.
'Turns out, the water tanks are overhead, and a pressure-fill had nudged an already loose 2" hose segment between the two tanks. So, an old leak was now dripping steadily.
Simply reaching into the tank bay and tightening the hose clamp fixed the problem completely.
'Also gave me a chance to spritz some Rustoleum over developing rust to arrest the process, tap down a metal edge where a dimwitted technician had raised a sheetmetal corner trying to pry open the bay access panel and left the damage to eventually chew through the bottom of my forward tank!
My guess is that the best qualified person to attend to 90% of routine maintenance on these RVs is none other than the owner.