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....
I was running the GY 17.5" G114s and was hoping for 5 years, but one let loose at 4 1/2 years. Always run at correct pressure with the TST 507 TPMS and every thing was normal till BANG and rubber flying every where. Now running Sailun tires.