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There are 3 wheelbases for the M39/M809/M939 series 5 tons: 167, 179, 215". The M818 is 167" and the M814 is 215". To convert a M814 to a tractor, you would need to cut off some frame overhang. The M819 has the 215" wheelbase but the same length frame as a standard 5 ton so the 5th wheel...
Don't forget the M246, M819 and M933 tractor/wreckers and the FMTV M1088 tractor. There is an 8x6 tractor in the M915 series (M920) but it is not a 5 ton.