What should you check at the back of a fifth wheel to ensure safety?

To ensure safety at the back of a fifth wheel, it is critical to check that it is locked onto the kingpin. This connection is essential as it secures the trailer to the tractor. A properly locked fifth wheel prevents any risk of disconnection while driving, which can lead to accidents or loss of control. Verifying that the kingpin is securely fitted into the fifth wheel locking mechanism is a fundamental safety step before operating the vehicle.

Other aspects, such as the trailer lights functioning, are certainly important for visibility and compliance with traffic laws, but the connection of the fifth wheel to the kingpin is paramount for safe towing. The landing gear being fully lowered ensures stability when the trailer is parked, and securing jack stands is vital for safe maintenance, but these do not directly impact the towing connection's integrity. Thus, ensuring that the fifth wheel is locked onto the kingpin is the most critical safety check in this scenario.