The really good money to be made with a top level company such as Walmart is as a owner/operator. The O/O owns their own tractor, and pulls company trailers. The O/O is a small business owner, who has a significant financial investment in that tractor ( a new one could be worth upwards of $250,000 ) The O/O gets paid by the miles driven, and of course the O/O has a number of business deductions that help to reduce their tax situation. Company drivers are Walmart employees, who get paid by the mile, and get company benefits.
The problem with the transport industry worldwide is the large number of poorly operated trucking companies, who try to beat each other on the prices they offer to their customers. This results in a "race to the bottom " with all kinds of short cuts on safety, a lack of proper vehicle maintenance, and hiring drivers who are inexperienced and dangerous. Its not JUST an American problem. JimB.