I have gone thru Atlanta and around Atlanta and found it to be no big deal either way. In fact the go around has a ton of trucks on it. But then again I am from Chicago, so everything else is a piece of cake for me.
Just beware that 'many' rest areas no long allow staying overnight.
AND
Don't plan on using the The Flying J just outside Atlanta to dump. Some brilliant engineer designed the concrete driveway along side the dump station to slope AWAY from the dump. Trust me nothing will come out of your tanks. :R
There is a real nice easy on easy off KOA just before you hit Atlanta. I usually plan to stay there the night before and get up real early and go 'through' Atlanta before their rush hour and it is a nice pleasant drive.