What should you do when changing lanes with a trailer?

When changing lanes with a trailer, it’s essential to always allow for the added length of the trailer. This is crucial because trailers can extend the overall length of your vehicle significantly, affecting the space you need when moving into another lane. If you do not account for this extra length, you risk a collision with vehicles in adjacent lanes, as the trailer may encroach into another lane before the towing vehicle has fully moved over.

Understanding the turning radius and the trailer's path during lane changes is also important, as it can differ from that of a standard vehicle. This consideration helps ensure safety for you, your trailer, and other road users. The other choices do not adequately address the safety concerns related to the added length and dynamics involved in towing a trailer.