Replacing tires at 7 years RV trailer service is a good plan. The Interply Shear forces that are working to create a tire failure are some 24% higher in trailer use than when a tire in used on a vehicle or truck.
I can't post a direct link but if you Google on "RV Tire Interply Shear" that should take you to a post that explains the Science behind tire failures in RV trailer service.
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Tire Design & Quality Engineer (Ret) 37 years Design experience + 15 years Forensic Engineer Experience
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