My family had a Chevrolet dealership. They had Buick from 1920 to 1973, Chevrolet from 1930 to 1973 and Oldsmobile from 1958 to 1973. They sold the business in 1973. so as a kid that was born in 1944 I was basically raised in the dealership. I remember the 50's through 1973 very well. The only decals that I remember coming on trucks was my dad's 1963 Chevrolet pickup that came from the factory as his demonstrator and was inviting people to come and test drive it. No other trucks had anything on them.
Jim