We always think of tires as the life-blood of our trucks. Any thought or look of an issue, we buy a new set, usually about four years or so. Unless something odd happens, like a cut or nail - a road hazard.
The one place we never try to 'save money' ... your life and family lives ride on your tires. The damage potential on a blowout is much greater than the cost of a tire, or even a set. Others might think differently. We save bucks when we can, but not on tires. We buy BFG AT's, but there are plenty of good solid brands out there. Bargain tires never enter our picture.