I found this picture in an old book I just bought. It is called "Festschrift zur Denkmalweihe der deutschen Kraftfahrtruppen am 7. Juni 1931" (honorary publication of the induction of the memorial of the German Motor Troops on June 7th 1931).
This is memorial was totaly unknown to me. It was destroyed after WW2 and it seems that there are no existing fotos available.
the picture shows the official memorial of the German Kraftfahrtruppe (transportation troops), inaugurated on June 7, 1931 in Potsdam. The inscription was rather prosaic and said "1914-1918. Den Deutschen Kraftfahrtruppen" plus an Iron Cross and the letter "K".
The vehicle on the base is very strange indeed. I assume that it was designed as an idealized composition carrying typical elements of the A7V, the MarkIV, and possibly of an AFV used during the war - in order not to offend members of the different crews. For another perspective see: