Okie,
I think you are referring to using your truck and pulling a car hauler trailer belonging to a company who would also find your loads and allow you to operate under that company's operating authority. That type of hauling is often referred to as "Hotshotting" although the term more accurately describes hauling smaller/lighter pieces of general freight not heavy enough for an 18 wheel tractor trailer and needing to be delivered quicker.
It is a tough industry to make a living in. Car sales are soft right now so it is probably difficult to find loads if you are not already established. There is simply not enough money in it to make it pay. Anyone who hired you to do this providing you with authority and a trailer would expect you to do it for less than $1/loaded mile. That would barely cover your expenses and wouldn't pay you any income. You'd just wear out a truck.
Even if you have your own authority, your own commercial liability, and your own trailer there is not a lot of money in it. You could make more money or, looking at it another way, you would spend less trying to make a few dollars as a Wal-Mart greeter.
I started hauling travel trailers commercially in January 2005 when the economy was booming and RV sales were great. I worked very hard, ran 400,000 miles in less than 3 years, and made a little money but I already had a pension and my wife has a good job, no kids, no mortgage, etc.
Now the economy is soft, RV sales are in the tank, and guys who have done it for years are looking for other driving jobs.
I'm not sure if you are fully aware of the strict DOT enforcement that apply to any commercial driving job. You would have to have a $1 millon commercial liability policy which is very expensive, CDL Class A, driver's annual physical and physical card, follow very strict hours of service rules, keep a driver's logbook, have commercial inspection sticker, reflective triangles, and fire extinguisher, stop at all scales, obey weight rules, and possibly even get into IFTA fuel tax reporting. It is not something you can just do part time or occasionally and ignore the DOT.
My sincere advice would be if you want a driving job, apply to one of the big truck companies and learn to drive an 18 wheel OTR rig. Most of them are hiring. Be a company driver and wear out their equipment, not your own.
I loved RV transporting. It was a lot of fun. But it is a grueling job that requires you to drive 600 to 650 miles seven days a week, in all weather and road conditions, live away from home, sleep in cheap motels, eat bad food, and wear out a new truck in a very short period of time.