Raupenschlepper Ost was a fully tracked, lightweight vehicle used by the Wehrmacht in World War II. It was conceived in response to the poor performance of wheeled and half-tracked vehicles in the mud and snow during the Wehrmacht's first autumn and winter on the Soviet Front.
RSO towing 105 mm howitzer
A Raupenschlepper Ost (RSO) in service just before the Kursk offensive in Russia
A Raupenschlepper Ost pulling 105 mm howitzer in Skanderbeg Square, Tirana, the capital of Albania, after taking over the city from the Italians, September 1943.
RSO/01, Sinsheim Auto & Technik Museum (2004)
The M4 High-Speed Tractor for World War II was an artillery tractor used by the US Army from 1943.
M4 high speed tractor with 90-mm ammo box
155mm Long Tom howitzer towed behind an M4 High Speed Tractor.
An M4 at Batey ha-Osef Museum, Tel Aviv, 2005
M4 High Speed Tractor at the National Museum of Military Vehicles