I know when I got mine home from dealer, there was water leaking under trailer. The Tech, in his walkthrough, had added SOME water to the fresh water tank to demonstrate its use. Bad thing with this model, you have to crawl under trailer to almost MIDDLE of it, and unscrew a valvecock to drain the fresh water tank. He had tried to tighten it, and did not tighten it all the way, so it drained a little. I opened it, got a a face full, and it drained totally. The fresh water tank showed empty on the gauge, but it wasn't.
If you have not done that, you probably have water in the fresh water tank.