Okay, I'll join the club. One time while dumping the black tank, using the Blue Boy. First load to dump station was all black tank waste. Second trip was less than half black tank waste with a black tank flush to top off the transfer tank. And off to the dump station.
Got back just in time to find a waterfall starting to come off the roof. I'd closed the black water valve but forgot to turn off the tank flush hose.
I was lucky, no leakage on the inside at all. Just 2 extra trips to the dump station. And a really good flushed black tank.
