My wife and I went on a five-day trip to the Black Mountains of NC. We keep our extra clothes in a duffel bag which we put under the bed. After we got to the campground we pulled the duffel bag out to get some clothes and discovered that it was wet! Upon investigation, I found that the floor was very wet under the bed! We hadn't spilled anything and there was no leakage from the windows
the door or the overhead fan or a/c unit. I crawled under and opened up the hatches to examine the various pipes and water heater etc. It was dry as a bone in there! But the carpet directly under the bed closest to the pump/heater/etc. was very wet.
One thing that we noticed was that the pump would periodically "grunt". A leak somewhere in the system?
How would this one spot be wet? (About twelve inches wide by three feet long.)
We did fill the fresh water tank before we left for the trip, so it was full. It was still full when we got to the campground, so no leaks
from there. Anyway, the water would have had to leak "up" to get to the floor if that was the source. And the weather had been bone-dry for quite some time. This was very recent water. We did not notice it before we left to head for the Black Mountains.
(I haven't had time to do a thorough search since returning. We don't keep the trailer stored here at the house. It will be Wednesday before I can get back to our Casita