On the Eastern Front, the roadways were extremely primitive and with seasonal mud the Germans required a fully tracked supply vehicle to maintain mobility, hence the introduction of the Raupenschlepper Ost (RSO) - a fully tracked, lightweight vehicle by Steyr. The kit offers the RSO/01 or RSO/03 build choice, and comes with an optional canvas rack, tarpaulin top, snow/bog track extension pad, and driver.