Truckies use mirrors only to reverse their trailers. In a Coach or RV if going forward, you steer the top of the wheel in the direction you want to go. In reverse, it's the same. You look in the mirrors and decide if you want the rear of the trailer in your left or your right mirror. Turn the BOTTOM of your wheel in the direction of the mirror you want the trailer rear to move towards, and you will never get confused backing your trailer again!!!!