Probably shouldn't admit this but I ran the B.F. Goodrich Radials on my 37 for20 years. My truck does stay in the shop and I did look closely at them every time I washed the truck. Still no cracking ect when I took them off this summer. I took the tires to the recycle place so no one would think they were practically new and run them which would have happened if I left them at the tire place!!!
......needless to say, the day before I ran the little blue pickup well past 100 on I-85 then later that night decided I'd be smart for once in my life and had new ones put on two days later! I realize I got lucky this time!!!