from the perspective of the driver of the vehicle while facing forward in the driver 39 s seat in the preferred embodiment if the sensor plate detects the trailer 39 s tongue to the left of the ball then the left arrow 210 is illuminated indicating to the driver that he must maneuver the ball to the left as the tongue is brought closer to the ball circular light 235 is illuminated indicating to the driver that he is making progress similarly if the sensor plate detects the trailer 39 s tongue to the right of the ball then the right arrow 215 is illuminated indicating to the driver that he must maneuver the ball to the right for proper alignment as the tongue is brought closer to the ball circular light 240 is illuminated indicating to the driver that he is making progress when the tongue is directly over the ball and trailer 39 s tongue is ready to be lowered onto the ball all lights on the display box 200 are turned off except for the large central light 250 central light 250 is preferably red in color and the largest light on the display box 200 when this large red light comes on it indicates to the driver that he can stop the vehicle because the ball is in the home position and the tongue is ready to be lowered onto the ball the home position being defined as when the tongue is directly over the ball and hitching of the two.