If you want to know what on earth he's saying, it's here. And what it means, here.
If "Mercy sakes alive" was the strongest way your average trucker had of expressing himself, the world might be a slightly nicer place.
There was of course the spoof soon after - Convoy G.B. by Laurie Lingo (ooh, I just got that!), which is actually quite funny (unlike most parodies). Lyrics and a downloadable MP3 here, though you need to listen to the original first to know why something like this amuses me:
"The combine harvester shred a wheel,
And the driver lost control.
And a mobile DJ crashed his van,
So we ain't gonna play no Soul, 10 - 4."