If you have time try to route yourself via the Natchez Trace starting in Nashville, Tn. Nice free National Park Service Campgrounds along the way. No services but they are very nice and the price is right. After Natchez go through Louisiana via 165 and try to spend a day or 2 at one of the CG in the Kisatchie national Forest. This will take you to I10 near Kinder Louisiana.
It would be helpful if we knew what kind of rig you have. There are opportunities for parking on a beach etc that I do not put in here because I have no idea what size your setup is. It makes a difference in some CG's