When should a helper be used to assist while backing your vehicle?

Using a helper while backing your vehicle is crucial for ensuring safety, and it's advised to have assistance whenever you need to back up, regardless of the circumstances. A helper can provide guidance to the driver to avoid obstacles, pedestrians, other vehicles, and any potential hazards that may not be visible from the driver's seat. This practice enhances situational awareness and helps prevent accidents, particularly in larger vehicles where blind spots are more prevalent.

The reasoning behind the other options highlights specific situations in which some might think a helper is necessary, such as only when a trailer is involved or during backing on a curved path. However, backing maneuvers are inherently risky in all scenarios, and having someone to assist can help mitigate those risks effectively at all times, not just in specific instances. This emphasizes the importance of safety and caution during backing maneuvers.