The Goodyear Endurance are a recent addition and I think are the only trailer tires made in the USA, Alabama if I remember correctly. I put a set on my boat trailer and they made a big difference in the ride. No more bouncing and flexing like the Carlisle's did. I also just put a set of Hankook TH22 trailer tires on my Excel as my options are a little more limited with 17.5 inch wheels. They replaced a set of 6 year old Michelin's which were starting to show signs of belt separation.