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The Marathon brand is an ST design- There is much less reserve capacity than an LT of comparable size- ST tires are for trailer use only- LT tires are for use on pickups and commercial trailers- The reserve capacity is greater than an ST tire- We went to LT tires on our trailer in 1992- Prior to that, we replaced 7 or 8 Marathons in our first year of fulltiming- We have not had any failures since we installed LTs- Incidentally, I am retired from Firestone so I think I have some knowledge of the products out there- JMHO- Don
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