All good advice so far. If you're on the fence about the tire, you could contact some shops on your route to see if they are stocking what you prefer to run in the size you need, and what it would cost you. If your itinerary is solid, you could even schedule it before you go. Most shops will give priority to someone with trouble while on the road, but won't be able to do so if they don't have the tire you need in stock.