Has anyone here shortened a crewcab up to use a standard short 6' bed? If my calculations are correct I would need to shorten it exactly 14". I arrived at that length by finding the difference between a short bed wheelbase 117.5" and a long bed wheelbase 131.5". If this is correct and I subtract the 14" difference from the crewcabs 164.5" wheelbase then my new wheelbase should be 150.5". Do these figures look right? Or would the safer bet be to "mock" the whole thing up with the 6' box to see how it looks and then cut accordingly?