General Motors Co. is initiating a fresh electric-truck business geared toward delivery services, the latest in the company’s efforts to commercialize battery technology it is developing in-house. Following the news, shares of GM hit their highest mark since the stock’s initial public offering in 2010.The Detroit auto maker said on Tuesday that it would start making electric delivery trucks and motorized dollies as part of the division, called BrightDrop, that seeks to capitalize on the now-thriving market for e-commerce and home delivery.The new division plans to roll out later this year an electric truck designed specifically for commercial purposes: called the EV600, it will provide a 250-mile range on a single charge. The move pits GM in opposition to Ford Motor Co. and its recently introduced electric delivery van, as well as electric-vehicle startups such as Rivian Automotive, which is making plug-in vans for Amazon.com Inc.