On Thursday, Tesla CEO Elon Musk unveiled the EV maker’s latest marvel: a fully electric heavy-duty semi truck that can travel 400 miles within 30 minutes of charging, Musk says, with the same hauling capabilities as a typical 18-wheeler. The sleek rig also boasts the company’s semi-autonomous “Autopilot” feature, a centrally located driver’s seat, and lots of cupholders. As a surprise bonus, Musk also revealed a new sports car, a replacement for the company’s first offering, the Roadster. Accor…