Final answer:
Most current trucks use an integral hydraulic power-assist steering gear system, which features a motorized pump that helps the driver steer with less effort by providing hydraulic power assist directly in the steering mechanism.
Step-by-step explanation:
The power-assist steering gear system used on most current trucks is integral hydraulic. This means that the system is built directly into the steering mechanism, providing hydraulic power assist directly where it is needed. Similar to power brakes and the systems used in heavy machinery like bulldozers, this type of steering gear system employs a motorized pump that supplies the hydraulic pressure to assist the driver in turning the wheels with less effort. Heavy-duty vehicles such as trucks and backhoes leverage hydraulic and mechanical lever systems to effectively manage large loads with preciseness and less manual effort, as illustrated in figures showcasing the machinery.