[blucar]

I have had a lot of experience with '36-41 Ford 1/2 ton pickups and a few 1.5 ton trucks.
I don't recall ever seeing a weight tag on any 1/2 ton until the post war years, '46-48. I think it was in '48 with the new '49 Ford trucks that data/serial number plates started to appear on the glove box doors.
Most of the other truck manufactures, GM, Dodge were all using data plates on their trucks.
One of the exceptions to data/serial number plates on commercial vehicles is if the vehicle was a government vehicle.