Schwerer Wehrmachtschlepper (Heavy Military Tractor), or sWS for short, was a German World War II half-track flat-bed cargo vehicle used in various roles between 1943 and 1945. Production: 825 halftracks. Manufacturer: Büssing-NAG and Tatra. Bibliography:

• German Half-Tracks of World War Two - Frank V. De Sisto, Concord Armor At War 7054
• Die mittleren Zugkraftwagen der Wehrmacht 1934-1945 - Reinhard Frank, Waffen-Arsenal 134, Podzun-Pallas-Verlag 1992
• Halbkettenfahrzeuge: German Half-track Vehicles 1939-1945 - J. Williamson, Almark Publishing, Wehrmacht illustrated No.4
• German Half-Tracked Vehicles of World War 2: Unarmoured Support Vehicles of the German Army 1933-45 - John Milsom, Arms & Armour Press 1975
• Die Halbkettenfahrzeuge des Deutschen Heeres 1909 - 1945 - Walter J. Spielberger, Motorbuch Verlag 1993