That is right in most cases Greg. You essentially "lease" to a company that has their DOT authority. But, don't let that make you think it is easy. Alan's Mom and Dad own a small flatbed trucking company. They own only one truck and have 8-10 lease trucks at any time. They have their authority, but it wasn't cheap to get it or to keep it, and it's even harder for new companies to get their authority. They have to deal with the DOT and they handle the billing, but the lease trucks have to carry their own insurance, pay all their own bills (fuel, expenses and repairs) and give a % to the company they are leased to. Plus you pay out for your own expenses first and collect your pay later, so you would have to have some cash in hand to get started.It's my understanding you run under their authority, not yours. What you need is a DOT physical, annual truck inspection, CDL, and 500K insurance.
You are a contractor and the company for which you work provides the DOT authority.
I'm not saying that you cannot make a decent living trucking, but I don't know any wealthy ones either. There are a couple of reasons that Alan doesn't drive a truck and is an electrician instead. One of them is he doesn't want to be away from home and the other is he can make more money doing what he does now.
But, if you like to travel, you might like it for awhile.