I wouldn't recommend using anything less than a Full-size truck or SUV to tow a car. Pulling the car around is easy enough, but trying to do so with a car not rated for that kind of load(keep in mind the ratings are max ratings) can be scary. When the weight of the car being towed is a large percentage of the weight of the truck that is towing it, it can be difficult to control. I watched my friend nearly lose it several times when he used to trailer his PT Cruiser from show to show using an Isuzu Trooper. He finally did lose it while towing a slightly heavier car. IF you do decide to go with a light truck or SUV for this duty, make sure you take necessary precautions. Most light trucks can't handle a high tungue weight safely and can really make the truck unstable as it puts a high load on the rear wheels and tends to make the front end light relative to the overall weight on the 4 tires. This makes steering sloppy and slow. There is an ongoing project on
http://www.nissanperformancemag.com which involves prepping a Pathfinder for Tow Duty. That may give you some hints. But if you can, I'd highly recommend a larger truck. My friend eventually started borrowing a friend's dually and it was stable as a rock towing his trailer with car.