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 to my post about tire life. I made a trip to Branson on the tires after making the post. The tires held up fine and did not loose any air pressure even though we went over some really bad roads. If I had had time to replace the tires, I would have but it was a spur of the moment trip. I am pretty conservative so I will replace the almost 7 year old tires before the next trip.