Looks like you will pass south of Plains, Ga (southeast of Columbus). There is not alot there but you might run into Jimmy Carter at Ma's Kitchen or can visit the National Historic Site, which is essentially the town.
Around Warm Springs, Ga, you can take in the Little White House and FDR state park and Callaway Gardens.
Consider skipping Atlanta and taking US Hwy 27 north through West Central Georgia. Good highway with some 4-lane.
If you are bikers, the Silver Comet Trail runs through Cedartown, Ga and you can get a good bike fix in either east or west. There is a tunnel and a tressle towards the east on the trail. To the west is the Alabama state line. Stay away from there.
On up US Hwy 27, Rome, Ga is pretty nice. Sloppy Floyd State Park is there. Braves have a minor league team there if you're into baseball.
Up towards Chattanooga, Tn, take in Lookout Mountain by riding the incline train.
Are you planning on taking US Hwy 129 from Knoxville back to NC? You will encounter a road you do not want to pull a trailer through unless it's extremely short and you are extremely brave.
If you do take US Hwy 129 back to NC and survive, you will pass near Fontana Village and Fontana Dam. Catch the Appalachian Trail there for some hiking and fishing.
Near Helen, Ga, there is Anna Ruby Falls. You can tube the upper Chattahoochee River in Helen as well. We have had some rain for a change so the river should be floatable.
Anyway, I hope these ideas help.