This may sound crazy but what I would DO is join the Family Motor Coach Assosiation, THEN I would use their Michelin program to purchase them. You get a great price and they have a SUPERIOR road service program.
So the service deal is simple, you get a guaranteed price from Michelin on the roadside tire price, no getting gouged at 3 am ....
TCI will change it out on the side of the road, you pay them direct, the tire is billed thru Michelin itself ... TCI is the Michelin Dealer for truck tires.
TCI has 150 locations across USA, several in Dallas itself.
I would ask Eric HEss who to use, if you don't want Michelins. He has an 18 wheeler wrecking service in Gainsville, Hess Towing, he and his son Josh raced TCCRA for many MANY years.
2130 Fm-1199, Gainesville, TX 76240
Cross Streets: Between CR-407 and CR-404
(940) 612-4377
He has come with his wreckers to a few mud races and towed everyone out for free.