If you have the optional factory flip out towing mirrors be very careful when adjusting them. The interior ball joint that allows the mirror to change position freezes up with time and the extra pressure it takes to make adjustments torques the mirror until it cracks. Don't ask me how I know!! I now adjust the undamaged mirror using both hands equally centered either on the top or side and it still creaks and groans before moving. Won't be long before it also cracks. P. O. S. design!!!