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Trailer tire aging is very unpredictable. Most tire manufacturers have a ballpark or target figure that can be found in their advertisement brochures, internet PDF files and most commonly, in their tire warranty packages. In my researching I find that Carlisle Tire probably made the first public declaration for their ST tire aging. It was a wide 3-5 years and has been duplicated numerous times in other well established internet tire information outlets.
Other tire designs by popular brands such as Goodyear or Michelin have predictions out to 10 years. But, even those protect those predictions with recommendations for tire inspections by experienced tire technicians at the 5 year mark.
IMO tires used on an RV trailers, no matter their design, must all come under the same age limit scrutiny. The constant load on RV trailer tires will play a major role in their long jeopardy. Just maybe, the higher the load capacity reserves the longer the life span. But, even that, may not counter the effect of long inactivity intervals that increases the effect of fatigue or more commonly, degrading of the tires.
Read the tire’s warranty package. And, remember, no matter what the design, they MUST be considered age-out tires.
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