W194N11481 McCormick Dr., P.O. Box 309, Germantown, WI 53022(800) 624-8473

TPR UniLock® Automatic Vehicle Restraint

Loading Dock Truck Restraint

The TPR UniLock® is the only trailer-positioned vehicle restraint that can automatically remove "RIG Wedge" pressure.  RIG Wedge is caused when the trailer is pushed forward during loading/unloading and the trailer's Rear Impact Guard (RIG) applies so much pressure to the restraint's hook that the truck driver must reverse the trailer in order to release the restraint.  The UniLock has an advanced cam design that first rotates the hook away from the RIG to remove the pressure, and then rotates down to a stored position.


The UniLock vehicle restraint also has an internal safety mechanism that locks the restraint's hook in place when pressure is applied, maintaining a secure engagement.  This makes it universally effective on any obstructed Rear Impact Guard (RIG), including intermodal trailers with cover plates that prevent the restraint's hook from latching on top of the RIG.


The UniLock is designed to withstand a pulling force in excess of 32,000 lbs, and has a service range of 4” to 10” horizontally from the face of the dock bumpers and 9” to 30” vertically above drive approach. The integral motor, gear and brake assembly is specifically designed for the UniLock. The UniLock vehicle restraint is highly adaptable to new or existing loading docks.

Patent Pending


Now installed with   iDock Controls
Advanced Cam Design

Hook rotates away from the trailer's Rear Impact Guard first, then down to a stored position, releasing RIG Wedge pressure without the trailer reversing.

Locking Mechanism

Internal safety mechanism to lock the hook in place when force is applied from the trailer's RIG during loading/unloading, maintaining a secure engagement.

Universally Effective

Maintains secure engagement on any obstructed rear impact guard, including intermodal trailers with cover plates.

Advanced 3-Color Light Communication System

Loading docks are noisy and horns may be missed. The McGuire advanced 3-color light system has an amber caution light easily seen by the dock attendant warning a safe capture has not occurred so they can take appropriate steps to secure the trailer.

Designed With Keeping Contact With the Trailer RIG in Mind

An exclusively designed integral gear motor, gear and brake assembly keeps the capture hook continuously engaged. Combine this with a low profile 9” carriage and a service range of 9” to 30” off grade and you have what you need in a vehicle restraint.

McGuire UniLock Vehicle Restraint

UniLock Engaged

UniLock Engaged on Cover Plate

Hook Locked with Safety Mechanism

UniLock Installed

Unilocks Installed on Completed Dock

TPR® and TPR UniLock® Restraint Overview

UniLock Testimonial - Determine Your ROI

McGuire Restraint Overview

UniLocks Installed on Dock

Want to know more about the TPR UniLock™ Automatic Vehicle Restraint? Request a Quote today.
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