After driving through a heavy rain for about 2 hours when we stopped we noticed that the carpet by the slide-out was wet. Also the window tracks had water leaking from just the sliding windows. What I found. When the slide-out is closed the rubber seal on the bottom of the slide-out only sealed up the front bottom half. There is a gap on the back half of the bottom seal that I could feel with my fingers. That puts that area in direct line with water coming off the back tire when the camper is moving. There is a narrow sheet metal piece attached to the camper that shields the water coming off the front tire. I made a sheet metal guard and attached it to the bottom of the camper not the slide-out with self tapping screws. I haven't tried my fix out yet. The real correct solution would probably be to align the whole slide-out to correct the bottom part of the seal that doesn't seal. I'm not up for that yet. I'm really not fond of "take it to a dealer."
Regarding the sliding window water leaks I suspect the corner window seal (glazing) that is rolled inward top and bottom is the problem. This also just leaks when driving down the road in the rain.
To cold right now to crawl under the camper to take a picture but I have one of the window seal issue but I don't know how to post it here. I need easy to understand picture posting instructions.
Bob