If the weather looks like it is going to be good along the Blue Ridge Mountains and you really want to go to Memphis. You might want to go a bit different route.
Take I-10 to East of El Paso (about 150 miles east)
Take I-20 to Dallas
Take I-30 to Little Rock, Arkansas
Take I-40 to Raleigh
mileage is about the same as going through Atlanta.
Another place to eat is a quirkly hamburger joint east of Little Rock in the town of Scott-Cotham's Home of the Hubcap Hamburger. It is the size of a hubcap. (place that make Bill Clinton and George Bush fat). Only thing is you need to check the hours they are open...
If you are coming stopping in Memphis, I would stay at the Motel 6 at 210 S. Pauline Street (good parking for large rigs) and take a cab down to Beale Street-about 3 miles away. For good music and the best ribs go to the Kings Palace-stay away from B.B. Kings, too noisey).
If you are coming through Atlanta, you have to do the Varsity but the one downtown is too hard to get to with what you are driving. Go to the one in Athens Ga just down the road. And follow that up with best BBQ this side of heaven at Lexington BBQ in Lexington North Carolina.
Scotishbob