Tesla’s Elon Musk says the Semi will be able to travel 500 miles on a single charge. Tesla Inc. Chief Executive Elon Musk is taking on the commercial truck market with an approach that defies conventional expectations: an all-electric vehicle capable of traveling for hundreds of miles on a single charge. Commercial truck makers trying electrification initiatives have largely focused on smaller trucks for short-run duties, arguing the battery range, weight and cost of long-haul electric trucks makes them impractical. With the Semi, unveiled this week and due out in 2019, Mr. Musk is promising a vehicle that can travel 500 miles on a single charge—enough to cover most regional freight deliveries—and is cheaper to operate than diesel trucks. Some potential customers said they are willing to give Tesla a try. Retailer Wal-Mart Stores Inc. said Friday it has preordered 15 Tesla trucks to test. J.B. Hunt Transport Services […]