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The main purpose of the trailer hand brake is to stabilize the trailer during parking. When a trailer is parked, especially on an incline, the hand brake ensures that it remains secure and does not roll away. This is particularly important for safety, as an unsecured trailer can lead to accidents or damage. The hand brake applies force to the trailer's braking system, holding it in place and providing peace of mind for the driver.

While stopping or slowing down the vehicle is an important function of the vehicle's main braking system, the hand brake specifically aids in securing the trailer when stationary. Similarly, assisting in making sharp turns or preventing skidding on icy roads are not the primary functions of the trailer hand brake. Those aspects are generally managed by the vehicle’s main braking system and handling techniques rather than the hand brake itself.