Uber Freight says its app offers drivers more transparency and consistent earnings, but some truckers are worried it won’t help them for the long haul — In the summer of 2019, Richard Hernandez, an Arkansas truck driver, took what seemed like a straightforward job: Move 40,000 pounds of peanuts from the Planters factory in Fort Smith, Arkansas, to the Sam’s Club Distribution Center in Searcy, Arkansas, for $680. He found the job through Uber, which since…