I don't know about Tenn, but here in Texas cedar posts hold up LOTS of miles of barbed wire. Fences made out of cedar posts last 50 years. I have never seen one rot in the ground. The "sap" is what preserves them. We have truckloads of cedar posts and no end in site.
Believe me, if someone could find a good use for cedar trees, they could make more than a million.
Are you near a metropolitan area? Talk to a nursery and see if you can set up a "split rail" TYPE of fence made out of ceder posts. Don't split them, but like a split rail. Straight or zigzag them. The city folks like that country type look. Give them a commission on what they can sell. Try talking to landscapers.
Just a few ideas from a state that has just as many cedar trees as you do. In fact, when I was a kid we called the folkes who lived in the hills "cedar choppers" cause that's what they did for a living!