Have an American Car Dolly, and have only used it 2 times for short trips. There seems to be plenty of room between the fenders for my car, but I am a little concerned about turning really sharp corn...
Put some masking tape where you think the fenders will rub. This won't protect the car if there's serious rubbing, but it should tell you if there's minor rubbing and then you can figure out what to do about it.