They actually sold bed kits to convert your car to a truck!
Thanks for posting that Bear,that was interesting. Never to old to learn something,l didn't know those chev utes were built here.l have never studied up on them but l assumed they were imported.Years prior to purchasing my current El Camino, I was looking at purchasing a 1936 Chevrolet Utility Pickup with right hand drive that had come from Australia.
I ended up in emergency surgery and it sold before I recovered.
It looked like a 36 two seater coupe with a body that flowed continuously into the bed sides. This was not a box stuck in the trunk, It had Chevrolet markings.
Here is a link to show you what that body looked like. The one I was looking at was in fairly good shape with a green paint.
History of the Holden Ute dates back to Chevy Utes - Gasers.com