The writing on the back used to say "SWEETNER" My ex father in law had it put on there as a play on words as he used to use the truck to haul the 66 Mustang to the local race tracks. The name of the Mustang was "Brown Sugar"
I have somewhere pictures of them together but the car was being pulled by his newer Chevy truck. I also have some pictures were I was racing the truck and spanking a mid 60's Chevy off the line. Beat at the end as well.