Overloaded? Nah, it's a truck. It can handle it, right?

While camping in Murrells Inlet, SC I saw a guy towing a tri-axle Airstream with a Dodge Magnum. Had a large hitch that almost dragged on the pavement. I am sure that Airstream had a GCWR of 9600# and I doubt that the Magnum had a towing capacity of that amount. Had Canadian plates on the vehicle. He said it had plenty of power to tow the trailer, not sure about stopping it in an emergency.