FWIW The understanding I gained while researching tires for our TM a year or so back was that we only need to use enough PSI to maintain an acceptable tire profile under load for the tire to give good service. For instance, you can stand the tire in the corner with no weight on it and it will retain an acceptible profile with "0" PSI. Load it to it's max and it may need the full 80 PSI to retain a safe profile. Goodyear has a chart on it's site that shows carrying capacities at various PSIs for their ST tires. I have to admit however that we ran our Marathons at the full 50 PSI even though Goodyear's chart said 40 would be OK.
It would be nice to know if we are the only TM owners who never had a tire problem in five years of ownership or if that is the case with the vast majority of owners. There is no question however that ST trailer tires suffer failures -- which may explain why Michelin and other big names don't make them.
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Frank
Former 2002 TM2619 Owner
2005 Toyota Tundra AC 4X2
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