marvmarcy wrote:
Your tires are commercial tires and much stronger than the STs and LTs most other folks are running. The 17.5 tires should last 7 years, especially the way you are taking good care of them. I would consider spending the money on a tire pressure monitor system instead of new tires. The new TPMS will monitor both pressure and temperature, thereby letting you know if any tire is having trouble. Of course, nothing will protect you from road hazards that will take out a tire regardless of its age and condition.
Marv