Exact same problem!
We were getting ready to drive away with our new Windsport 34J and noticed water on the floor coming from the kitchen, a lot of water. Turned out the P trap on the sink wasn't tight - ok husband tightened it. BUT why was resting water getting that high? When the slide is in the grey water hose is crimped in an uphill position. Extend the slide it's fine.
__________________
|