It’s hard to imagine a more abrupt career change than the sharp U-turn former NASCAR driver Bobby Hillin Jr. took about 10 years ago, when he shifted gears from racecar driving to high-tech digging. But by founding Texas ReExcavation LC — T-Rex for short — in Houston, Texas, Hillin discovered an off-track outlet for his competitive zeal, this time in the world of hydroexcavating and industrial cleaning.“There were three things I thought were pretty cool about the industry,” says Hillin, once the youngest driver to win a NASCAR Cup race (at age 22 at the Talladega Superspeedway in 1986). “First,
