I also travel Atlanta in a 45' with a car in tow several times a year. Just keep an eye on the look out for which lanes you need to be in. A GPS will help with the lanes. Go slow and watch ahead for proper lane and you will not have any problem. Early morning or 10am to 3pm are best. Also, Sundays do not seem to be bad until after 12 noon. Game days or other big activity in town all is off. I would rather go through Atlanta than try for any two lane road around Atlanta. You will never know the condition of the smaller roads as to accidents or closures for some other reason. I think you are worried for nothing.