Watch the Six Days online guitar lesson by TrueFire from Play Country Guitar 5: Lick Vocabulary
Six Days - Lick 19 is a video guitar lesson presented by Joe Dalton and is sourced from 50 Country Guitar Licks You MUST Know.
The rhythm figure on Dave Dudley's Six Days on the Road had an electric rhythm part something like this one. Adding the g and b notes to the A chord makes it an A9th. This figure has blues notes and movement to it. It also has a certain bite that helps to drive the music. You will hear the descendants to this in many modern country songs.