David:
Looks post war to me also although I don't understand the blacking out of the info on the doors.
Over here, this is/was a fairly common design for carrying telephone poles or concrete or iron pipe. I cannot state with authority if what I heard or read is true, but it was told to me that this design was used to save the weight of the trailer and to add to the allowabe payload of the rig. The round or square dimensions of the poles/pipes lent themselves to be secured easier than general cargo and there was no need for a frame and floor.
For some strange reason I cannot just now find a picture of one but there was a 2 1/2 ton GMC 6X6 done during WWII that was called a "Bolster" truck and ran single rear tyres. I will post a photo when I find one.
Bill
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