My truck leaked too Mine is an August 2018 build that I purchased in late 2019. Noticed it after having the truck home for one day. Noticed a musty, moldy smell. Truck did not have that "new car smell" The dealership found the rear window was leaking. replaced the rear window, seals, rear seat, rear floor carpet that was Soaked, new head liner, cleaned up all the rusty metal seat brakets and other wet items in the back of my crew cab. If you notice any funny smell, check the seat carpet. Mine had no visible indication of water leaking.