..clarifying it is....i understand what you are saying regarding the lack of information and confusion of prototypes. regarding the posted picture, the cab is pretty well obscured, but seeing it would for sure identify it. when i tagged it as a 1938 chevrolet, it was based on comparing what could be seen in the original photo, to other photos. if you look at the rear frame near the lisence plate you will notice that it has been angularily cut facing inwards for example. this was the bracked which held the pintle hitch leaf spring . this detail and a few others look identical to the chevs. i'm hoping someday that more information on these trucks becomes available, but for now the search continues.
mike