Define: small trailer? What is small to one person is a monster to another. You need to know the size of the trailer, overall weight of the trailer, and tongue weight of the trailer. In addition to weight, is it a flat bed or box type trailer. Box trailers push more air which creates more drag and makes the tow vehicle work harder.
Most cars today are FWD and FWD cars are poor tow vehicles. The transmission and gears are all small and compact to fit into one unit attached to the motor. They can only pull trailers that weight about 1000 lbs fully loaded. If you tow with a FWD vehicle you can expect to have transmission issues, which are expensive repairs.
Therefore you should focus on RWD cars. Many RWD cars are performance cars that are expensive and have lots of specialty parts that are expensive to repair. Next comes basic RWD domestic cars such as the Ford Crown Victoria. These can tow a trailer and better yet to get one with either a towing package, or the police intercepter package. RWD Crown Vic's are out of production so now you are looking at used cars. The recent Chrysler 300 is RWD also.
Best vehicles for towing are mid sized SUV's, or pick up trucks. If you are looking at a loaded trailer 1500 lbs and up you are best looking at an SUV.