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The following quote is from the Keystone owner's manual. The quote is there because its a NHTSA mandate as its an industry wide standard.
For a tire retailer to change designated sizes that are not authorized by the vehicle manufacturer, they would have to take full responsibility for that action.
"To maintain tire safety, purchase new tires that are the same size as the vehicle’s original tires or another size recommended by the manufacturer."
As JRTJH has said, going up in a tire's load capacity does not constitute a size change, just added load capacity with increased inflation pressures. But, valve stems and wheels must have the capacity to support the increased inflation pressures - LRC 50 PSI to LRD 65 PSI
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