>>you can just keep on truckin.
Keep on truckin’ is a slogan from 1968 “Zap Comix” by Robert Crumb.
Not 70s and Crumb was adapting it from 1930s vernacular in jazz and western-swing songs (he was collecting on 78s).
and yes that is the F-word being used in a 1930s RCA-Bluebird song.
https://www.youtube.com/watch?v=LFcHD8XsCEc
Then there was this little gem...
The Harlem Hamfats-Let’s Get Drunk and Truck
https://www.youtube.com/watch?v=d5P4BBe7G8E
The standards were different for “race records” that white people weren’t supposed to listen to.