Mercedes-Benz outlined plans to start selling an electric heavy-duty truck in about five years, a week after Tesla Motors Inc.’s initial sketch on battery-powered commercial vehicles failed to impress investors. The 26-metric-ton Mercedes-Benz Urban eTruck will have a range of about 200 kilometers (120 miles) per battery charge, parent company Daimler AG said Wednesday in a statement. The model, targeted for inner-city tasks such as supermarket deliveries, could go on sale by “the start of…