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Originally Posted by kaptain Jack
Whats a DPDT switch?
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Double Pole, Double Throw switch. Basically a switch that reverse the polarity to the load, in this case the screw driver motor. That way it can raise or lower the dump box. You would want a three position DPDT throw switch for this application. The center position is 'off'.
Alternately, you could also use a cheap ESC to do the same job. A DPDT switch would still be less expensive, even with a cheap servo to actuate the switch.
Depending on your budget, there are some wireless infrared trailer systems that have outputs to run a couple accessories on the trailers, beyond lights. These could be used to run a screw drive also.