We had the Roadmaster Tow Defender and after the third time a pivot bolt broke I pitched it. Generally they broke when I really needed the Defender as I was on dirt roads and the flex arm (nearest the coach) caught on something when the rear end went down low. Currently using the Roadmaster Guardian which works fine. It is a pain to stow. I have the stowmaster on the coach but don't want to move the coach with it there as it bangs against the coach and blocks both airflow to the rear radiator and view of the license plate. It is also a pain to breakdown so I can put it in the back of the Jeep.