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There use to be, back in the 70's I bought a pair at a 76 truck stop that had a rotary wiper that was just below the middle of the mirror, and a line situated between the middle of the mirror and top to align with the back of your trailer you were hauling, to give you a reference that the back of the trailer has made it past the truck you were passing.

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GEORGE GARNER

Lvl 2
3y ago

What else can I help you with?