Why I am so obsessed with the origin of the chassis is this: Chevrolet AFAIk did not produce such wide 6x4 chassis. Someone must have converted the chassis from 4x2 to 6x4.
Now I do not want to look like a batavo-centric looney, but coincidence or not, DAF of Eindhoven delivered such conversions from 1937 onwards on Fords and Chevrolets. Of course these conversion kits were called Trado's.
Coincidence or not examples of 1937 Trado-converted Chevrolets were delivered to some party in Spain during 1937:
Linked from
trado/walking beam/boomerang