In September 1937, In. 6 placed a contract to Borgward for the development of a gepanzerter Munitionsschlepper - armoured ammunition tractor - which could carry up to 1000 kg of ammunition (500 kg in the vehicle, 500 kg in a trailer) in every terrain. The 20 vehicles of the pilot series of the Vk. 3.01 were delivered in 1940. From October 1941 to February 1942, altogether 28 exemplars of the improved type Vk. 3.02 were manufactured. These were 5 cm broader and the driver’s compartment was 5 cm higher. The mudguards were now straight and no more curved.