What should you inspect regarding the trailer?

The correct choice emphasizes critical components that contribute to the safe operation and integrity of the trailer. During a pre-trip inspection, it is essential to examine couplings, landing gear, tires, and lights thoroughly.

Couplings are crucial because they connect the trailer to the towing vehicle, and any issues here could result in a loss of control. Inspecting the landing gear ensures that it is functioning properly and can offer support when the trailer is stationary. Tires need to be checked for proper inflation, tread depth, and any visible damage, as they are vital for maintaining traction and safe stopping. Lastly, lights must be operational for visibility and signaling, ensuring compliance with safety regulations and allowing other drivers to be aware of the trailer’s presence.

Other choices may include important components, but they don't cover the essentials needed for trailer safety as comprehensively as this option. For instance, brakes, headlights, and trailer lights are crucial but do not address the connection and stability features like couplings and landing gear. Similarly, the hitch and suspension are parts of the towing vehicle rather than the trailer itself, while the battery, alternator, and fuel system pertain to the vehicle's engine rather than the trailer.