How much does it cost to drive a truck in the United States?

Although I have never done this, I have heard something about it. First of all, buying a truck head costs about 100,000 US dollars. Then you have to join a truck union. The union will receive various orders and then allocate them to you. New members may receive relatively poor and unprofitable orders, but If you don't join the union, you need a lot of connections, otherwise it will be difficult to get along. This is what I know. In terms of income, it is said that you can't earn 6-7 million US dollars a year, but it will be hard.