The halftrack prime mover shown in this picture (towing a 15cm sFH18 heavy howitzer battery) is the Sd.Kfz.7 mittlerer Zugkraftwagen (8-ton). It was the most widely used prime mover type of which 10,257 units were built. The K-Gerät (Kastenträger-Gerät) moveable bridge and simple broad leaf camouflage is interesting too. K-Gerät is a light self-supporting 16-ton bridge on three part pontoons or blocks with length 78,8m. Its design was copied from the British Small Box Girder bridge in the mid-1930s. The K-Gerät used the same panel length as the SBG, but slightly amended the bracing details. A 1943 article in the German military magazine describes the bridge being used on the Russian Front in conjunction with pontoons and goes on to say that 'the bridge has given good service and is similar to bridges used in enemy armies'
Book "One More River To Cross" by J.H. Joiner