What will aid in vehicle handling of a caravan/trailer?

Answer: B — stabilizer

Adding additional mirrors or increased tyre pressure may improve driver visibility but it does not directly impact the handling of the caravan/trailer. Lowering vehicle speed may slightly help with handling, but the main aspect that will aid vehicle handling is using a stabilizer. A stabilizer attaches to the towing vehicle and the caravan/trailer and helps reduce swaying or tipping of the caravan/trailer. This allows for smoother and safer handling while on the road.