The next time it rains, get inside the compartment with a flashlight and track down exactly where the water is coming in.
It could also be leaking through the sealant around the door frame. Mine did.
Chris and Pat
2016 Ram 3500 Cummins Aisin Dually, 4.10 axle, Auto Flex Air Ride Rear Suspension, Pace Edwards JackRabbit tonno, Transfer Flow aux fuel tank, B&W RVK3600 hitch
2017 Cedar Creek 36CKTS, MORryde IS, Disc Brakes, 17.5"