I have goodyear marathons and have replaced all four over the last 2 years due to the original 02 tires all starting to crack, separate, and sometimes bubble. By keeping them inflated, wiped down with 404 protectant here and there, and keeping a watchful eye on them I have managed to avoid blowouts and replace them incrementally. I would get the best rated, highest weight class tire I can find for around 100 bucks. The marathons work well for me and we probably trialer close to 2000 miles a year on highways at 65mph. At that speed I want the best tire I can get. Seems like everyone is in agreement that these things have a 5 year lifespan for average towing. I found it best to replace before blowout.
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