After extensive adventures involving tire failures on a recent 3,000 mile trip, we ended up with a new set of Firestone tires on our 5er. Not that I especially wanted those, but there was nothing else available in a small East Texas town on a Saturday. We started the trip with a set of Goodyear Wranglers that were 5 years old. By the end of the trip, three out of four had failed, and I threw away the 4th.
We'll see how good the Firestones are. No telling where they may be made.
Moral of this story: If tires are 5 years old, get new ones!