If that's the kind of work you want to do, I'd suggest locating somewhere around Michigan. I'm speaking from a complete lack of knowledge, but I have it in my head that steel and Detroit go together.
Other than that, there are a TON of trucking companies in Ohio and Indiana. A ton. Whether they pay an O/O worth a damn, I don't know. But there are a ton.
Mainly I'm just posting this to give it a bump since no one else replied