As noted previously in a post, stay tuned to the weather. You may need to adjust when you leave home by a couple of days either way depending on storms. Snow and ice in the south can be particularly bad as they have less equipment and experience dealing with it. Also, plan to leave as early in the day as you can and try to drive as far as you can the first day. There are not a lot of campgrounds open in the north during that time of year. If unable to leave early or drive far, consider staying in a motel the first night. Best to be comfortable and safe during the trip. As you get close to the GA/FL line, there are two campgrounds at GA exit around St. Mary's. One is a KOA and one is Good Sam. From there it is only a short trip to the FL Welcome Center for your free morning OJ.
Best wishes for a safe trip.