This strange looking vehicle is most likely a commercial Commer of the N series which was made from 1936 to 1939. Who can tell something about the unit sign on the left front side?
This Commer of the N-series was used for refuelling a German fighter plane of the type Me 109. The photo was made on one of the British Channel Islands in the year 1940. (Photo: German federal archive via Wikimedia Commons; License: Creative Commons BY-SA-3.0-gb)