Tesla has been teasing images of the truck it plans to unveil on Thursday. ‘It can transform into a robot, fight aliens and make one hell of a latte,’ Chief Executive Elon Musk said on Twitter about the upcoming vehicle. Billionaire entrepreneur Elon Musk will find himself in a familiar place on Thursday night, pitching an unconventional idea to capture the imagination of investors—while his company Tesla Inc. TSLA 0.84% is grinding through “production hell” with the Model 3 sedan. This time, Mr. Musk will be promoting an electric semitrailer truck, which he has been trumpeting on Twitter for months. “This will blow your mind clear out of your skull and into an alternate dimension,” Mr. Musk, Tesla’s chief executive, promised in a tweet Sunday ahead of this week’s demo event in Hawthorne, Calif. Tesla shares the next day soared 4%—the kind of pop that continues to fuel Tesla’s […]