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Maybe you're thinking of a Johnson bar, which is either attached to the steering column or on the dash, and is used to actuate the trailer brakes without actuating the remaining brakes? Real handy for extendable RNG trailers, where you must keep air supplied to the trailer, but have to apply the trailer brakes.

A cheater bar is the bar used to tighten down strap winches and chain binders on flatbed and other open deck trailers.

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