Thanks for the replies, but since the splash apron is bolted to the running board and the running board is bolted to the frame, because the bed is independent of the frame moving the bed will not help with the issue of gap between the splash apron/running board/frame and the back of the cab. Either the frame moves backwards or the cab moves forward to gain more gap between the two or at least that is the way I am seeing it. Am I missing something?
Thanks again.

Ken