I believe Six Days on the Road was written by Bill Mack the deejay on WBAP.
“Six Days on the Road” was co-written by a couple of Alabamians, the words by Earl Green and the music by Carl Montgomery. This would be Green’s only hit, but it was a biggie—done by several artists, in several languages, and a perennial fixture on “oldies” playlists decades after it dropped off the charts.