Was he at Cosco? I got fed the same line there, only it was a safety issue, they would sell me only the man. spec tires. A few words later, I went to Sears, got the tires of my choice, which were the same size as the ones I took off, 40,000 accident free miles later. He needs a second opinion, I would have to think if he kept it under 140 mph it won't be a problem.
"When I was younger, I could remember anything, whether it had happened or not." - Mark Twain