I run the same only the 295 size. Goodyear puts something in their rubber compound that has UV protection and it seems to work for me. My tires are 8 years old and have no cracks or problems. I replaced the front 2 (steer tires) this summer because I felt I should, but the Goodyear dealer, upon inspection, said that he felt it was not necessary. Have them all inspected for cracking, sun damage and tread wear at least once a year and never drive with them under inflated.
Goodyear - Michelin is like a Ford - Chevy thing here, and your favorite Korean or Chinese tire will be your Toyota !! jmho