Bearcat is right! I too started in a tractor trailer and did it for several years. As a single, I think you can make more with a big rig. But, if it's your own rig, your fixed expenses and maintenance, are much greater, than a straight truck or van. Expediting, as a single, if you can get with an outfit that will keep you moving year round, you'll make a decent living. The secret is finding that outfit. Especially in this economy. Like Bearcat said, try one, drive for a company...but I'd do six months, instead of a year, then try the other.