Is the tire discount available for van size tires too?
If you are talking about the Michelin tire discount that FedEx CC is offering, yes, it works for anything, van, car.... The trick is to find a tire dealer that is set up for 'michelin national billing' or some crap like that. The only one that I was able to find was NTB/Tire Kingdom. They are set up for it. You can go to the extranet under tire discounts and print the letter with instructions and take it to the dealer. But, make sure you follow up on this, cause most people at the tire dealer don't know what they are doing, even when they call Michelin and are told exactly how to do it, and they mess things up.
I would say that with the problems I had (charging me the wrong price because they entered the wrong code in, charging me twice for the same tires - NTB people didn't know what they were doing, but a few calls to Michelin fixed it) it is not worth the hassle, but then I paid $125 per tire for my van instead $180, so I might do it again.