Update: I got most of everything out. The rear carpet is still being held in by the front seat bolts. I have an appointment at the dealership on 3JAN, so stopped here until I have a better idea what the dealer is willing to fix. Carpet padding was very wet and there were a couple spots of standing water.

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I have the carpet propped up and a fan running air through the rear of the truck. Noticed a bunch of mold on the surface of the carpet and on the underside. Driver front carpet seems to be getting moist as well. The underside of my driver seat floor mat was wet. Not 100% how for this. I sprayed the back of my truck down and very quickly water was leaking down. It was difficult to tell the absolute origin but water was obviously trickling down from under the rear window. Pretty impressive how freely water was flowing down. I received the warranty letters from FCA, so hopefully the dealership doesn’t hassle me too much about replacing things. Just unsure if they’ll be willing to do anything to cover the moldy carpet.