Abstract: A light projector assembly for use with a trailer and a truck is presented. The light projector assembly is mountable to the trailer in proximity to where a tail light blinker assembly is attached, e.g. directly underneath the truck. The light projector assembly operates in sync with the tail light assembly, i.e when the tail light is activated by the driver of the truck, the light projector assembly and tail light assembly are both activated. The light projector assembly includes a lamp that when activated by the truck operator to indicate a direction of travel causes a stream of light to project from the trailer at angles to the horizontal and vertical of the trailer so that the beam of light is projected down on the ground in a way that indicates a distance between the back of the trailer and the end of the beam of light.