We are currently on a trip, and we did not unhook the car from the rv a couple of nights at the start of the trip. I believe we are following the tow instructions pretty carefully. Regardless, 2 nights in a row, after about 3 or 4 after stopping for the night, car is still hooked up to rv, the parking lights came on all by themselves. I turned them off and they stayed off. Any ideas why this occurred?