Which type of vehicle is likely to have the most difficulty staying in its lane during strong winds?

The reasoning behind the choice of a double with empty trailers being likely to have the most difficulty staying in its lane during strong winds stems from the vehicle's configuration and weight distribution. Empty trailers have less mass, resulting in reduced stability. When subjected to strong winds, they can be easily pushed sideways, making it harder for the driver to maintain control and keep the vehicle centered in its lane.

Additionally, the design of a double combination, with two trailers, inherently increases the vehicle's profile and surface area, further exacerbating its susceptibility to wind forces. In comparison, heavier vehicles, such as a tractor pulling a loaded flatbed trailer or a triple axle vehicle with cargo, have more weight and stability, which helps in resisting the lateral movement caused by wind. A single axle truck, while still susceptible to winds, typically has a lower profile and may not experience the same dramatic effects as a double combination with empty trailers.