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A hydraulic system in tractor trailers plays a crucial role in various operations, particularly in enabling loading and unloading. This system uses hydraulic fluid under pressure to power hydraulic cylinders or lifts, which can assist with positioning cargo, tilting trailers, or operating lift gates. This capability is vital in ensuring that loading and unloading processes are efficient and safe, contributing to effective logistics and transportation workflows.

By using hydraulic systems, operators can easily manage heavy loads that would be difficult or dangerous to handle manually. The strength and precision offered by hydraulics make this technology indispensable in the operation of many types of trailers, especially those designed for transporting heavy or bulky items.

While other options present valuable vehicle functions, they are primarily not the main role of a hydraulic system in a tractor trailer. For instance, steering typically relies on a different aspect of hydraulic assistance used in steering mechanisms, fuel systems operate separately, and stability during transit is managed by various suspension systems rather than hydraulic systems directly.