Johnny Hiland/Don Kelley Truck Drivin Man, this guys got it down.

I found this video on youtube and was wondering if someone knows what passing chords are being used?
http://youtu.be/WEQOidsXiVM

I saw a post about this a couple months ago on here, ill try to post a link on here to it if they talk about those passing chords.

Thanks any help would be appreciated. I think the first chord walk down is G-B minor-E minor 7th. Then hit the B note on the A string to C. Then B9th slide to C9th.