With the StopSensor Trailer Alignment System is designed to prevent the grain-hauling truck driver from having to get out of and back into the cab multiple times (or be assisted by a spotter) in order to properly position the trailer for loading/unloading the contents. Consisting of a laser sensor, detection reflectors, and audible alarm, the device, which mounts on a tripod or directly on the auger, confirms when the trailer is aligned and notifies the driver via a red light that can be seen in the rearview mirror. Once set up, the StopSensor stays put until ready to be move to the next grain bin or pit.