This is a novelty song inspired by the CB radio craze of the mid-'70s. The story of "Convoy" was told in CB jargon and with a Country and Western (the "C.W.") twang. C.W. McCall was a character created by songwriter Bill Fries
See http://www.songfacts.com/detail.php?id=3034 for more info, trivia and a break down of some of CB terms used in "Convoy" .
Was the dark of the moon on the sixth of June
In a Kenworth pullin' logs
Cab-over Pete with a reefer on
And a Jimmy haulin' hogs