Final answer:
When backing up a truck, you should look over your right shoulder for clear visibility and use mirrors to maintain awareness of surroundings.
Step-by-step explanation:
When backing up a truck, it is recommended that you look over your right shoulder. This allows you to have a clearer view of the path behind your vehicle through the rear windows and enables better judgement of distance and position.
It is critical to maintain awareness of your surroundings, including any potential hazards that may be present while reversing. For improved visibility, you should turn your body and head to the right and use your rearview mirrors as well. Proper technique in using mirrors and looking over the correct shoulder is crucial for safe vehicle operation.