We have a 2017 Apex 269RBKS. We had a leak issue on the carpet in front of the sofa, which is in the large slideout. It was still under warranty and the dealer found the problem was a leak in the window seal.
Since then, no problems. Good luck....
2017 Coachmen Apex 269RBKS with Summit Pkg.
2014 Ford Expedition with factory installed HD tow pkg.
Blue Ox SwayPro WDH