Schwere Wehrmacht Schlepper (SWS), HalftrackSchwere Wehrmacht Schlepper (SWS), Halftrack Schwere Wehrmacht Schlepper (SWS), halftrack began production in late 1942 and they were used until the end of World War Two. Most of them were used on the Eastern Front where they were employed to carry loads and tow trailers and artillery. They were slow but their main purpose wasfulfilled by their ability to plow through the harsh conditions of Russia,particularly the snows of winter and mud of spring.