The s. Zgkw. 12t (Sd. Kfz. 8) was mainly developed as towing vehicle for heavy and heaviest artillery guns and mortars and their partial loads. In this case it was a mount of a 21 cm Mörser 18.
Besides the usage as towing vehicle for heavy artillery guns the s. Zgkw. 12t was used as tank recovery vehicle, too. This s. Zgkw. 12t was towing an Sd. Ah. 116 four-axle flat bed trailer.