For decades, trucking has provided big-rig driver Frank Mora and his family a decent living. He doesn’t expect that will last forever. Most major truck manufacturers and several well-funded startups are busy testing automated or driver-free vehicles. Test models of cars that will shoosh passengers around town without a human at the wheel have attracted much media attention. But it’s apparent that when driverless vehicles hit the road for real, they’ll be driven by commerce, and that means trucks will likely lead the pack.