The only other thing I could think of would be for a plate to rise up straight out of the bumper or tail gate if it's thick enough. When in the recessed position, the top would simply sit flush with the surroundings.
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Trey
Current rides: 2000 BMW 540i/6 and 86 C10.
Former ride: 1979 Trans Am WS6: LT1/T56, Kore 3 C5/6 brakes, BMW 18in rims
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