A big truck that remains idle does not produce revenue and actually costs a company big bucks.... that's why many companies now have " Slip Seating" and " Team Drivers" i.e. two drivers operate the same truck in a 24 hour period. Charging batteries in a big truck for more than half a day is money lost. The only use I can see working to some degree is UPS, Walmart, USPS etc. that have short haul " Drop and Hook" dedicated runs . Those driverless trucks are a torpedo on wheels. I drove big truck for 46 years, there's no computer in the world that can make multi decisions in an emergency situation. It takes years of experience , skill and some God given luck not to kill someone as well as survive.