The electric semitrailer would have a 500-mile range and will roll out in 2019, if all goes according to plan. On top of that, Musk surprised the crowd gathered at the event with a new version of the Roadster, the high end sports car that originally got Tesla going about a decade ago. The new Roadster would have a range of 620 miles and is due out in 2020. Musk said the Roadster would have a zero to 60 miles per hour time of 1.9 seconds. “These numbers sound nutty,” Musk said at the unveiling on Thursday. The truck will also have Tesla’s semiautonomous driving system, which will help assist drivers and also have the ability to drive autonomously with other trucks. The convoy system would allow a lead truck to guide a group of other autonomous trucks to follow close behind, a system that would save on labor […]