Just passing this on and it may not even be related or the same situation as the OP.
One of my slide windows leaked. It is a window on the side of the slide that opens like the old school bus windows. The drain in the window track (bottom of window behind the plasitic cover) was blocked from debris from what I believe to be months of sitting on the dealer lot and gathering debris. This went unnoticed for various reasons I assume.
On our first trip, we had torrential rains and floor of our dinette/couch slide was literally squishy sopping wet. The window was the culprit. Water was overflowing the track at the bottom of the window and flowing inside the camper down the wall.
I had to run to Wally world and get a wet dry vac to suck up all the water. We just happen to have a couple of fans in the camper and we dried the carpet out overnight. We were able to lift the carpet edge up to direct air under the carpet as well.
Next day, I popped off that plastic/rubber cover off the base of the window and cleaned out the track and the drain slit. So far, so good.
During heavy rain, water just pours off the slide right down the side of the slide over that window. Those window drains are extremely important to keep clear.
Wishing the OP the best of luck in getting the leak identified. These are the worst kinds!
2017 Cameo 33RL