What term describes the weight built into the truck's structure to offset the load's weight?

The term "counterweight" refers to the weight integrated into a vehicle's structure to ensure stability and safety when handling heavy loads. In the context of telehandlers and similar machinery, the counterweight is essential for balancing the load being lifted, especially when the boom is extended. This design feature helps prevent the vehicle from tipping over, as the counterweight provides an opposing force to the load's weight, ensuring that the center of gravity remains within a safe range.

While "counterbalance" is also a relevant term that describes balancing forces in general, it doesn't specifically denote the physical weight used for stabilization. "Dead weight" refers to the weight of the load itself without consideration for its distribution or its effect on safety. "Load weight" simply indicates the weight of the object's being lifted and does not relate to the built-in stability mechanisms of the vehicle. Thus, "counterweight" is the most accurate term in this context.