Georgia Overland Trail
Kirk pointed this out to me a few months back and I took a look at it. Interesting trail. It start fairly close to where we live and it is only 400 miles. Here is a link to their website:
Georgia Overland Trail Website
The site has a lot of good information about the roads, etc. Make sure you read up as their were a number of closures that could affect your ride. In any case, it is a new adventure to try out if you have the time.