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The BIG thing to remember, is the M939 series truck has a bad problem of cracking the transfer when you put the truck in reverse when in 6 wheel drive !! That is why they put the warning labels on the dashboard !!

You might consider getting a M814 Cargo it has the 20 foot cargo bed so it has the longer frame, if you are in the hills I would NOT recommend the 1400 or 1600 they will use up to much torque to turn them !! You can turn the fuel up some on the NHC 250 Cummins and not be in trouble with EGT...