What should be verified when coupling a trailer before driving?

When coupling a trailer before driving, it is essential to verify the connections between the tractor and trailer. This ensures that the coupling is secure and that the trailer is properly attached to the towing vehicle. Check for the correct lock engagement of the fifth wheel or coupling device, and inspect safety chains or cables to confirm they are correctly connected and not damaged. This verification is critical for safe operation, as any failure in the connection could lead to a disconnection while driving, posing significant safety risks.

While other options, such as trailer registration, weight, and road conditions, are important aspects of overall vehicle operation, they do not specifically pertain to the immediate safety and functionality of the coupling connection, which is the primary concern before initiating a trip with a combination vehicle.