[OrrieG]

On mine all the cross sills rest on the frame, I did put 60 mil rubber roofing material between the sills and frame. I also made one more out of channel because there is a lot of space between two of them, which is where my original bed wood had failed. If you install an gas tank in the spare tire location getting to those sill bolts can be interesting... You might need to shim to get the accent lines in the door, cab and bed sides to align.