I've got around 9 or 10 months of car hauling experience. Went broke but that probably can't be blamed as much on the freight as it was the business owner.
A big down side to car hauling (in my mind) is all the onesy twosy crap. It really sucks to make your axle weights right when you have a 7 stop load. If it was all auction to auction, or auction to dealer it wouldn't be as bad.