What is the proper position of the fifth wheel when coupling?

The proper position of the fifth wheel when coupling is tilted down towards the end of the tractor. This positioning helps ensure that when the trailer is backed into place, it will engage correctly with the fifth wheel. The downward tilt facilitates a smooth connection and proper weight distribution during the coupling process.

A fifth wheel tilted downwards allows the trailer's kingpin to slide easily under the jaw of the fifth wheel, helping to secure the connection without misalignment or the risk of uncoupling while in transit. Ensuring that the fifth wheel is in this position contributes to safety and operational efficiency, as it provides a secure and stable setup for the combination vehicle.

The other positions, such as being horizontal or tilted incorrectly, could lead to difficulties in coupling, misalignment, or even potential accidents due to improper securing of the trailer.