What feature of the trailer aids in securing the connection to the tractor?

The feature of the trailer that aids in securing the connection to the tractor is the locking jaws. Locking jaws are designed to firmly grip the trailer hitch, creating a secure connection between the trailer and the towing vehicle. This mechanism prevents accidental disconnection while the vehicle is in motion, ensuring that the trailer remains attached to the tractor. The design of the locking jaws allows them to engage tightly around the hitch ball, providing stability and security during transport.

In the context of the other features mentioned: safety chains are important for providing an additional safety measure in case the primary connection fails, but they are not the main mechanism securing the connection. Control lights are essential for signaling when the trailer is in motion, but they do not play a direct role in securing the connection. Hydraulic couplers are involved in connecting hydraulic systems for braking or lifting mechanisms but are not primarily focused on securing the attachment between the tractor and the trailer. Thus, the locking jaws are the central component for ensuring a secure and reliable connection.