I for one would not use the Sonic to pull a trailer. The car is light weight, drum brakes on the rear, an I think you are just asking for trouble. I have hauled many tailers and all varius weights, and that is one reason why I kept my 2500 HD truck. I can see a bike rack, but a trailer with some lenght an weight to it, no way. What are you going to do when the trailer starts weaving on you? If you want to haul a triler, get a truck, or borrow someones. I loan mine out quite offten. (if the price is right)
Just my $.02 worth.