The band I produced, the Melungeons, or one of their alter-ego bands, have opened for Unknown Hinson here in Knoxville and some regional gigs since he was, well... unknown. Growing up, I used to know so many people who legitimately spoke like his character's inflection (which is VERY much a Western North Carolina/ Northeast Tennessee dialect), but they're all dead now. Sadly, I'm now probably as close as it gets without parody. That Billie Joe Shaver wrote and performed the Squidbillies theme is another cool bonus.
Unknown Hinson has a signature guitar and distortion pedal with Reverend. I think Gibson bought a blanket endorsement with Adult Swim on Cartoon Network for Metalocalypse and got Squidbillies by accident. It was also funny that both types of basses featured, Thunderbird Studio V's and Les Paul Standards, were either completely out of or in extremely limited production for the entire runs of both shows.