I found the Foothills Trail to be wonderful and very similar to the southern AT and surprisingly difficult in spots. If you'd like to see photos of the trail, here are links to the three hikes it took me to complete the thing, including the spur.
Oconee State Park to Hwy 178
Hwy 178 to Table State Park
Spur to Jones Gap State Park
Easy to find established camp sites. Miles per day depend on summer heat, winter daylight hours, and the like, but are very similar to the AT in GA, NC, and TN.