SSONS I was told a Goodyear Engineer the safety factor on overloading was greater on a GY trailer tire than the safety margin on over speed. On overload it was OK to run 85 PSI at the expense of faster wear. I had a FW that each axle was under the axle rating but the ODS was overloaded. At that time, I found a GY writing to support the 5psi increase on the E rated ST tires. Like wise the Engineer said SPEED KILLS ST tires. ST tires are 65mph Max.
Good Luck with your Future GY tires
Clay
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