Hi Brian, I'm new to trailers but am learning fast. Absent a structural leak or bad seal somewhere I know that if you have a slide out and your trailer is not level, it will tilt the slide roof back toward the trailer allowing rain water to drain back in instead of away from your trailer. So make sure it is level. Easy mistake to make at home as my friend did after returning from a trip.
Steve & Sue
2017 Grand Design 297RSTS Travel Trailer
2017 Ford F-350 Lariat Crew Cab diesel 6.7 SW LB 11,500 lb GVWR package
Former: Crossroads ST26RB