What should you expect when backing under a tractor to connect to a trailer?

When backing under a tractor to connect to a trailer, it is expected that the trailer will be lifted slightly. This occurs because as the tractor backs up to the trailer, the hitch plate on the tractor comes into contact with the kingpin on the trailer. When the two connect, the rear of the tractor may dip slightly, helping to engage the trailer and lifting it a little as the tractor takes on the weight. This slight lifting indicates a proper connection, allowing the locking mechanism of the hitch to secure the trailer for transport.

Understanding this interaction is crucial for ensuring a safe and effective coupling process, as it underscores the importance of observing how both the tractor and trailer behave during this critical phase of vehicle operation.