I have always replaced our TT tires every 3 years based on blow outs I had with ST tires. Our current trailer is on it's second set of LT tires and they completed their third season last year. What ...
I've let LT tires go beyond 5 years and didn't experience any tire problems until they began to show sidewall cracks....not the tiny spider webbing type cracks but 1/16 to 1/8 inch wide cracks. My biggest mistake was not covering the tires while in storage. Now I cover the tires.
Like others have said 5-6 years for replacement no matter how much tread is still left on the tires. Correct pressure at all times.
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