Before driving away, what is an essential check for your trailer connection?

When preparing to drive with a combination vehicle, confirming that the air lines are properly connected is critical. This step is essential because the air lines are responsible for operating the brakes and other pneumatic systems in the trailer. If the air lines are not connected correctly, it can lead to brake failure or other issues that compromise vehicle safety.

Ensuring the air lines are securely attached allows for proper pressure and functionality of the braking system. This direct link between the engine and the trailer is vital for safe operation, as it controls braking response and stability when driving. Properly connected air lines mean that the systems will work in harmony, crucial for maneuvering and halting a combination vehicle promptly.

Other checks, while important, do not have the same direct and immediate impact on the trailer's operational safety. Balancing the load, verifying lights, and checking the hitch for damage contribute to overall safety but are secondary to ensuring the air systems are functioning properly before setting off.