I do not know what pizza trailers have, but my two horse trailer has a four part system. First, there is a very strong claw that connects the trailer to the receiving ball on the SUV. Second, there is a set of inertia breaks that automatically apply breaking power to the trailer when the SUV brakes are applied, although these brakes do not work on the trailer in reverse (I.e., rolling backwards downhill). Third, the trailer has two safety chains that each connect to the hitch on the SUV. And forth, the trailer has an emergency brake system, that is activated by a cord that loops around the receiving ball on the SUV. If the trailer separates from the SUV, that cord will be pulled tight, actuating the emergency brake on the trailer.