Most ST tires age out after three years. I recall one mfgr. even stating that in their literature. My experience after going into the fourth year was two blowouts, at which point I bought new tires. Some folks have reported getting many more years out of theirs. After having bought into Sailuns, which are ST tires, I'm wondering if the three year caution applies. Same goes for the new GY Endurance tires. I know almost for certain the Trailer Kings I removed were very flimsy and probably would not have gone even three years.
