I should add that I did have trouble with two of them, both replaced at the trailer dealer. Failed exactly the same way. Seems several years ago they had a bad batch. If the car was hooked to the trailer and not running, parked overnight, the prodigy was draining the battery on the car. Normal operation is that while the car is running you are charging the batter on the trailer for the emergency breakaway system (typical utility trailer). There is a sensor of some type, like the isolator in the CI to stop the trailer battery from drawing from the car. Sensor failed in back to back units. Left me really scratching my head on why my 18 month old batter was dying. Very difficult when you have landed the balloon, chase crew pulls up, and by the time you have packed up the car won't start and you are out in the boonies.
But they stood behind the product and the never had a problem with the third one.