M4 Tractor
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The M4 High-Speed Tractor for World War II was an artillery tractor used by the US Army from 1943. Wikipedia
Engine: Waukesha 145GZ OHV I6 gasoline engine; 210 hp (157 kW)
Weight: 18 tons
Length: 210 in (5.33 m)
Maximum speed: 35 mph (56 km/h)
No. built: 5,811
Power/weight: 14.70 hp/t
Suspension: Horizontal volute spring