There is only one way to make the towing settings work on the rover and when they do, it makes a big difference. The Rover detects a trailer is connected by detecting resistance caused by the trailer lights. Because all modern trailers have led lights, there isn't enough resistance to be detected. I literally tried every device out there to fix this problem including splicing in resistors in my trailer wiring. This is the only device that works: http://www.ledtowconnect.com/p/development-history.html
I like the sound of this but it isn't cheap is it?