When my wife and I went out to Idaho to pick up our truck, the tires had great tread and no visible sign of dry rot. Because the owner told us they were "very old", we toyed with the idea of replacing them before we set out to drive it back home to NY, but decided they looked good enough. On the 2nd day of our trip, we regretted the decision when the front right blew out and almost threw us off the road at 55 MPH. After a quick change of shorts, we decided to buy 4 new ones on the spot. Here's how it looked: