If you want a stop in Tennessee, we like Spring Lake RV Park in Crossville TN off I-40. Back in level sites around small lake. Agree with Argie7 about Natchez Trace. Beautiful drive. We stayed at Davis Lakes Campground near Tupelo at the north end of the Trace, a days drive to the end at Natchez MS. We like to stay at River View Campground across the river from Natchez in Vidalia Louisiana. From Natchez MS you can drop down to Louisiana and go see the Tabasco factory in New Iberia if you have time. Go around Dallas to the north on US380 West. North to Oklahoma City to pick up I-40 again.