A very rare Chevrolet dealer installed accessory would have been a radio. Placing this more luxury item in a work truck was very unusual. Most people had limited incomes and a radio would be a big extra even for the family car.
To save tooling money on a new 1940 radio creation for the Chevy truck, General Motors used the base AM radio made for their 1940 passenger car. In the factory GM box delivered to Chevrolet dealers, a pair of right angle brackets were included. They attached to the front side of the radio head for mounting to the dash and could fasten to the radio at a 90 degree difference depending if it was attached to a car or truck.
On the car the radio it fit in a pre-made hole in the dash. On the truck it was secured to the underside of the dash to the left side of the steering column. The attached photos show the attached right angle brackets attached to the radio and set up for the truck.
Warning: Most all radios of this design have the dial made of a round rolling thin white “plastic” cylinder with red numbers. Shown in photo. When it is allowed to be exposed for many years in direct sunlight, this plastic in the window becomes very dark. It is as if it is burned! If you find a used unit for sale, be sure you turn the roller dial to see if the burned red numbers have not been rolled out of site.
This burned window portion of the plastic roller is not repairable and to date no reproductions are available. Yes, the radio may play with good sound but there will always be a black window on a certain radio station!