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Mark Martin Reveals What Keeps Him Busy After NASCAR Retirement

“I didn’t have any passion after I retired,” said Martin, now hooked on designing custom Newell motor coaches. “There’s something about those big wheels,” he laughed, tracing his affinity for these homes on wheels to his dad’s trucking roots. Each coach is “more detailed than building a house,” he said, with buyers lining up for his creations every two years.