The M6 High-Speed Tractor was an artillery tractor used by the US Army during World War II.
Wartime photo of a M6 Tractor
M6 tractor, Overloon
Side view, M6 tractor, Overloon
Front view, M6 Tractor, Overloon
An artillery tractor, also referred to as a gun tractor, is a specialized heavy-duty form of tractor unit used to tow artillery pieces of varying weights and calibres. It may be wheeled, tracked, or half-tracked.
Wheeled British WWII Scammell Pioneer towing an 8-inch howitzer
Tracked Finnish WWII Komsomolets (captured from USSR)
Half-tracked German Sd.Kfz. 7 towing an 8.8cm Flak
German RSO artillery tractor towing 105 mm howitzer, Albania, 1943