Just a reminder about old tires. The do fail. My Tbird was used only around town for the last few years. I had forgot that I bought the tires in 2001. Ooops. The right rear threw the tread at 55 mph.
Fairly minor damage. The rear inner shield is gone and a small chunk of the bumper just behind the wheel well. Luckily no damage to the fuel filler or vent line or the brake line.
One thing is that the car was steady thanks to the great suspension on the MN-12s. The tire did hold air for about 12 hours before it went flat.
So, if you use your cars infrequently check those manufacture dates. I forgot how old my tires were. The were not weather cracked at all.