There are a few factors to consider when choosing a car to tow a caravan. The weight of the caravan is the most important. In addition, you'll need to check the towing capacity and maximum tow ball weight of your car. The combined mass of both should not exceed the car manufacturer's stated GCM.
Most small cars won't be able to tow a caravan, so you'll need something with a bit more power. Larger 4WD or SUVs are generally good choices for towing a caravan. If you're not sure what your car can handle, it's best to consult with your dealer or an automotive expert.