Standard Conventional X C75 8500 175 2 Ton Standard Conventional X C78 8700 197 2 Ton Standard Conventional 1 X L71 7100 121 2 Ton Standard Low Cab Forward ... Standard Tandem 4 X M75 8500 RPO 175 2 Ton Standard Tandem X NI78 8700 RPO 193 2 Ton Standard Tandem X S77 10800 243 2 Ton Standard School