What is the main purpose of a truck's suspension system?

The main purpose of a truck's suspension system is to support the vehicle's weight. The suspension system is engineered to bear the load of the truck and distribute this weight evenly across the wheels. This ensures stability when the truck is moving and allows for proper handling and control, which is crucial for safety and performance. It also helps to absorb shocks and impacts from the road, contributing to a smoother ride for both the driver and any cargo being transported.

While enhancing tire performance and increasing fuel efficiency are important aspects of a truck's overall operation, these elements are secondary benefits that stem from a well-functioning suspension system. The cooling of the engine is unrelated to the suspension system's primary role, which is focused on load support and vehicle stability.