Raleigh and Tucson are about 1,860 miles apart by road. Split the difference and you arrive near Dallas, the city closest to the halfway point between them. That puts roughly 22 hr 8 min of driving on the Raleigh side and 17 hr 20 min on the Tucson side — the fairest single meeting point among the cities near the middle.
Over this distance most people will fly rather than drive the whole way. Dallas still makes a fair, central place for Raleigh and Tucson to converge, splitting the travel instead of asking one side to cross the country.
If Dallas doesn't have what you're after, Oklahoma City and Memphis are also close to the midpoint and worth a look — each keeps the drive reasonably balanced between Raleigh and Tucson.
City descriptions adapted from Wikipedia (CC BY-SA); photos via Wikimedia Commons, credited above.