I've been thinking this over for a couple days, no really easy solutions come to mind.
As I recall, he has 2 motors on the trailer, a winch motor, and a lift gate.
The winch will have 2 power relays that control the motor, one for each direction.
The lift gate will have one power relay that controls the up direction. The down will only be a solenoid valve, so not a concern.
As I see it, the easiest way would be to have 3 NC control relays, wired in series in the charge circuit. The coil of each control relay would be powered by the same signal that controls each power relay.
When ever any motor was in motion, one of the control relays would be energized, opening the contacts, opening the charge circuit from the vehicle.
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