My story is similar but the similarities stop when you went to the hook-up station. I went back to the side of the TT and found water running out from under my enclosed under belly... shut the water off and really freaked out wondering where my leak could be. I went inside the TT to find water had ran from the bathroom to under the wall on the other side and out the TT. I guess in my efforts to drain the water heater last time, I left the bathroom faucets on. I had water coming out of them, onto the floor and out the TT.
I stand by your last comment, I bet I won't do this twice