What must you remember after you have coupled up a trailer to an automatic trailer coupling?

After coupling a trailer with an automatic trailer coupling, it is essential to ensure safety by confirming that the coupling pin is fully engaged (point 1), which means the trailer is securely attached and cannot come loose during driving. Additionally, checking the position of the control pin (point 2) serves as a visual indicator that the coupling is correctly locked. These two checks confirm the trailer is safely connected. The third option is not required because the prevention of lateral movement is inherently ensured by the full engagement and the control pin; actively checking for side movement is not part of the official safety steps. Remembering these steps helps prevent accidents caused by an improperly coupled trailer.