Grigg, thanks for the reply. You are right about widening the bed vs. the cab. And the fender vs. 20" tire is a good point, too, though I think that could be worked around.
Just to confirm -- the outside-outside width of the wheels on the 4100 dual rear is *wider* than the single rear tires on a 3100, correct? Meaning, they stuck the extra two wheels of the dually on the 'outside' of the first two, not the 'inside'?
Given your point about cab width, there are problems either way... just curious which way ;-)
