tailboard ( synonym found)
Definition of tailboard:

°a hinged board or hatch at the rear of a vehicle that can be lowered for loading and unloading; a tailgate.
"The man in the very new overalls was just heaving a box up on the tailboard. - "The Big Sleep", by Raymond Chandler"
Definition of tailboard:

°a hinged board or hatch at the rear of a vehicle that can be lowered for loading and unloading; a tailgate.
"The man in the very new overalls was just heaving a box up on the tailboard. - "The Big Sleep", by Raymond Chandler"
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