Overnight Rv park on I-75 either south or north of Atlanta

Not a campground but the MALL OF GEORGIA is just east of Atlanta off I-85, I've driven past it a couple times visiting a friend who lives within walking distance. Lots of parking and most of those big malls invite overnight RV's to stay and shop.. You might want to kill a day anyhow and that's a good place to do it (give Matthew more time to head north).