Well according to the tire manufactures I am surprised they have lasted this long, Jeez I camp in the winter,I camp in the summer, I make sure they are properly inflated,I didn't pay enough for them,I don't sing to them or bring them home with me and sleep with them in my bed. I will quietly go buy some more cheap tires every other year and be happy to be alive. I should probably park the trailer on a velvet rug,jack it up an rotate the tires every day and not park near any ozone emitting device! And if you think about it,, they are almost ten years old 'cause 2022 is just around the corner!!