When uncoupling a trailer, what should be done after lowering the landing gear?

When uncoupling a trailer, it is crucial to follow a specific sequence of steps to ensure safety and proper handling of the equipment. After lowering the landing gear, the next step is to disconnect the air and electrical connections. This procedure is important because it ensures that the vehicle is disengaged from the trailer's braking and lighting systems, preventing any accidental activation or malfunctions when the trailer is being moved or detached.

Disconnecting these connections first allows for a safer uncoupling process, as it minimizes the risk of any electrical shorts or air leaks that could occur if the trailer were to be moved while still attached. Additionally, this step ensures that both the tractor and trailer are in proper working order for their respective next uses.

Following the disconnection of air and electrical connections, it is typical to perform additional steps for safety, such as securing the trailer with wheel chocks and ensuring the loading area is clear. This practice is essential in creating a safe environment, especially if the trailer is on an incline.

The other options either skip essential safety procedures or do not follow the correct sequence that should be adhered to while uncoupling a trailer. Therefore, understanding the correct procedure reinforces the importance of following safety protocols in the trucking industry.