The Hanomag SS 55 wheeled-tractor was manufactured from 1933 to 1943. The shown vehicle with the registration number WL-204896 corresponds to the initial series from 1933. The photo was made on 27th January 1940.
In the course of time, the design of the Hanomag SS 55 was changed. It was propelled by a four cylinder, 55 HP diesel engine. The towing capacity was 15 tons.
Most probably, both shown vehicles were special variants made for the Luftwaffe. The vehicle shown above had a large equipment box at the rear the vehicle shown below had a crew cab.