Schwerer Wehrmachtschlepper
Panzerwerfer 42 auf sWS
Type	Half-track
Place of origin	Nazi Germany
Service history
In service	1944—45
Used by	Nazi Germany
Wars	World War II
Production history
Designer	Büssing-NAG
Designed	1942—43
Manufacturer	Büssing-NAG, Tatra
Produced	1943—5
Number built	825
Variants	15 cm Panzerwerfer auf sWS 3.7cm FlaK 43 auf sWS
Specifications
Weight	13.5 tonnes (14.9 short tons; 13.3 long tons)
Length	6.92 metres (22 ft 8 in)
Width	2.5 metres (8 ft 2 in)
Height	2.07 metres (6 ft 9 in)
Crew	2
Armor	6-15 mm (certain models only)
Engine	4.198 litres (256.2 cu in) gasoline inline 6 cylinder, water-cooled MaybachHL42TRKMS 100 horsepower (75 kW)
Payload capacity	4,000 kilograms (8,800 lb)
Transmission	ZF kb 40D
Suspension	transverse leaf-spring and torsion bar
Ground clearance	46.5 centimetres (18.3 in)
Fuel capacity	240 litres (53 imp gal; 63 US gal)
Operational range	300 kilometres (190 mi)
Speed	27.4 kilometres per hour (17.0 mph)

The 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. The unarmored models were used as supply vehicles and as tractors to haul things. The semi-armored version could mount a medium anti-aircraft gun, while the fully armored model carried a 10 barrel rocket launcher (Nebelwerfer). Less than a thousand were built before the end of the war, but production continued after the war of an improved model in the Tatra plant in Czechoslovakia.