I don't have this written out, but I'll try and explain how I play it...
Truckers Tuning....down a whole tone
Chords throughout are G, C, D, with an occasional Em and Am.
The C chord is actually a Cadd9....mute string 6, fret 3 string 5 with finger 2, fret 2 string 4 with finger 1, open 3, fret 3 string 2 finger 3, fret 3 string 1, finger 4.
On the G chord, add that 3rd fret D note on the 2nd string with finger 3 and fret 3 on string 1 finger 4.
The D note on string 2 makes those chords sound real 'country'.
Am is the chord over "my friend", at the end of the chorus.
The guitar riff is G pentatonic.
Slide finger 2 from fret 2 string 3, up to fret 4, play that note twice more, then play fret 2 string 3, pull off to open 3.
Then play fret 2 string 4 and pull to open string.
This is followed by the root note of either the G or Cadd9 chord, depending on the part of the song.
Hope this helps