Really depends on your peace of mind. In my case since we full time, it would sooner rather than later if I was approaching 5 years out of them which the maximum time I would be comfortable with tire age depending on how I used them. A trailer tire blow out will really ruin your day, not to mention some consequential trailer damage too boot. AZ Traveler is giving you good advice on the tires, at least for his situation. YMMV.
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2017 RAM 3500 Laramie CCLB Dually CTD Aisin, OEM auto level rear air-ride, B&W hitch
2020 3813MS Legacy Cobalt FBP, MORryde 8K IS & pinbox, PI EMS,DIY mods by in-house "craftsman", RV security system Mk1 Beagle Alerter
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