I had a Tekonsha Prodigy RF brake controller installed on my travel trailer and am having problems with it. The remote (in the car) will not pair when the trailer-side unit is plugged into the MX. The behavior is like the trailer-side unit is not getting power. It does, however, pair when the unit is plugged into a car battery. So the problem seems to be due to the Tesla. Perhaps it's not providing a high enough voltage. Or perhaps the car isn't keeping the 12v line continuously on. Any ideas? Thanks.