One update on my installation. I was lazy and left the brake controller in place when not using it. This was a bad idea as the weight of the controller has pulled the panel I attached it to down a little bit and resulted in a squeaky noise when accelerating heavily. The vibrations were causing two panels to rub against each other. I now store the controller in the glove box when not in use.
Curious. Is this the Prodigy P2 or P3 controller or something else? I haven't heard any reports of this; I wonder if all of the clips that hold that panel are properly seated and undamaged.