Replacing one of my cab corners now. The dealership is putting POR on everything inside. I had them run the drain tube out the inside rocker. Im going to peel all my tape off both sides after this is all said and done and POR everything inside the rockers. I also now know where the double wall is in the cab corner, so i can drill my hole high enough to clear the double wall on the drivers side and get POR on both sides of the cab corner to stop any rusting. Hopfully i can get my hands on the drain tube and get it routed outside as well.