Cargo, Tractor, or other? M-39 series, M-809 series, or M-939 series? You can get anything from a gasser, to a multi-fuel, to a Mack, to a 250 Cummins, to an 8.3L Cummins. The choices are endless. Probably the cheapest way to get into a 5-ton right now is to look for an older M-39 series or...