What factor significantly influences a truck's height when loaded?

The height of a truck when loaded is significantly influenced by the weight of the cargo. When a truck is loaded, the weight distribution can lead to changes in the suspension system and the overall posture of the vehicle. Heavier loads can compress the suspension, which may lower the truck slightly, but importantly, it can also change the center of gravity and affect how the cargo is positioned. Knowing the height is crucial for ensuring safe operation under bridges, overpasses, and in areas with height restrictions.

While the material used in the truck can affect overall weight and design, it is not directly responsible for height changes under load. The size of the tires does contribute to overall vehicle height, but tire size remains constant regardless of cargo. Engine size impacts the vehicle's performance and capacity but does not influence height. Therefore, the weight of the cargo is the most relevant factor regarding changes in height when the truck is loaded.