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my guess is the plug is simply an engine block heater during the winter months... and the two electronic pieces on the tail are related to the trailer hitch (usually for 5th wheel testing when on the proving grounds) and measure various telemetry at that time...
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Im 99 percent sure thats what those are... I've seen similar setups in the past... That is unless they suddenly havea hybrid car that can power electrical devices.. lol
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