I heard water every time I hit the brakes the other day. Sounded like it was in the passenger door, checked it, door was fine. Crawled under truck, pulled a rubber plug right under the rear seatbelt bolt, and water poured out of the cab frame. Wondering if anyone might know where it's coming from? (rear window seal leaking??) Checked for cracks/holes on the cab under door weather stripping, looks okay.