I have a fifth wheel with Goodyear G614 G rated tires. They still have very good tread and still look good but they were made in the 19th week of 2014. I read that you can go between 6 to ten years....
Thanks for the replies, the tire on the other side is fine. There were low pressure valve stems installed when mounted, tires are about 4 years old. Probably did run underinflated