This appears to be an early German tank destroyer improvisation, consisting of a PAK 35/36 37mm antitank gun, crudely mounted on a Krupp Kfz 81 light truck (? Netherlands, 1940).  If so, it prefigured a long posterity of field modifications combining later PAK and (usually) armoured carriers and half-tracks.  Some divisional engineering shops made a bit of a speciality of such conversions.  Best regards, JR.

Improvised tank destroyer ?

Panzer column advancing through Western Belgium,May 1940.Lower right corner,German motorcycle(photographer?)Greetz,brummbar

Panzer column

A bit off-topic perhaps; I offer the excuse that Sepp Dietrich's first acquaintance with tanks came when he helped crew one of these as a member of Sturmpanzerwagen-Abteilung 15 in WW1.  This is a rare 'photo of a Sturmpanzerwagen A7V on the move - rare because they were not very good at moving.  This approximated to the early model of a tank as a "land ship" more than British prototypes actually called that.  It weighed 33,500 kg - not that much more than British heavy tanks of the period weighing in at about 29,000 kg.  However, it was painfully slow (perhaps 8 mph on road, if you were lucky; off-road performance was terrible), underpowered, clumsy, unreliable and difficult to deploy.  Armament varied, but typically would be one 57mm body-mounted artillery cannon and six machine-guns.  Crew was a staggering 18, composed of a mixed force of Army and Navy personnel.  Only 20 examples were produced; the German Sturmpanzerwagen-Abteilung generally relied on captured Allied tanks.  At least one tank-to-tank combat between these vehicles and British tanks is recorded.  In this, a single AV 7 pressed a pair of "female" British heavies (i.e. armed only with machine guns) until it was in turn driven off by a British "male" tank (armed with two 6-pounder guns) arriving late on the scene.  Given that the road speed of the British tanks (and, proportionately, their off-road speed) would have been even slower than that of the AV 7, it is surprising that either party was capable of driving the other anywhere.  I suppose that it took some vision for people like Guderian to see the great future that awaited the successors of vehicles like this ... Best regards, JR.