Yes - same issue here.
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I had Mastercraft Courser HTR Plus - 255-55-18 - installed. I believe the Mastercraft tires are manufactured by Cooper. The Courser HTR Plus also has a 'beefy' sidewall with a raised portion to protect the wheel.
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They had difficulty getting the tire to seat properly on the wheel. They used 'tire lube' on the tire and were forced to use a much more psi (75 or higher) to get the tire to seat on the wheel.
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