Raupenschlepper Ost which means "crawling tractor east" In order to cope with poor road conditions on the Eastern front the Germans built tracked tractors to tow all types of vehicles and to carry various loads such as food, ammunition and supplies. The RSO/1 was built by Steyr Werks in Austria. It had a pressed steel cab and a wood cargo body. The RSO/1 proved to be ideal for the mud and slush conditions of the Russian front. These vehicles were part of the Germans desperate efforts to avoid defeat by an overwhelming Soviet military. Approximately 23,000 were produced.