In my experience, you can get a tire guy off of truckdown.com who is much closer, has a spare tire in your size and can be out to your driver in less than an hour. Our costs are usually under $500 on the road for this, paid on Visa or TCheck/Comcheck etc. You may have to change out the tire when you're back at your home shop and scrap the tire but you still get a casing credit for it.
If you look for the tire guy that uses the national tire account he is usually a lot farther away, cannot come out for a couple hours, doesn't have your tire in stock or has to drive the other way about an hour to get it. Then when you get the bill - OUCH! You find that your tire price is protected but the service costs and mileage to replace the tire isn't.
We use premium tires in all positions (Michelin X-Drive Energy on tractors, Bridgestone R197 on trailer - no recaps) and monitor them closely. We've tried may options but this method wins hands-down and gives us little hassle on the road. We now special order our full maintenance lease trucks with these tires and asked them to take the tires out of the rate because we can do it cheaper.