Any luck with determining the speed rating for your tires? I would guess that they probably adhere to the industry standard and are rated at 65 mph - under normal pressure and load conditions. A few ST tires may be rated at speeds up to a maximum of 75 mph. Just wondering where yours fit in.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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