10-15 years ago there were plenty of options when it came to being an O/O car hauler. Jack cooper and Allied systems had O/O in the Union, but that all went away. Now a days I only know of a few companies, could be more but Hansen&adkins, Accelerated Services, United Road, Car transport, Ritchie Auto transport, H and S, Moore and Interlink! I know the first 3 companies have O/O for sure. The others I don’t know much about.
Good money can be made you just have to find what works for you and go from there. Once you find it stick to it. If it pays the bills it worth doing.