Abstract: The line backer is a device that assists the driver in backing up to a trailer by himself. It eliminates the frustrations of climbing in and out of the vehicle and walking back to check the alignment. It also can eliminate damage to the vehicle and the trailer that is so often seen. It works by a retractable cable that hooks from the vehicle and attaches to the trailer. While backing up to the trailer there are two led lights that are facing the driver, that signals which direction to turn and when to stop. The retractable cable is electrically grounded and passes between a left and a right contact which are charged by the battery and wired to the led's. Since the retractable cable will touch a left or right contact and, thereby, power a respective left or right led light, the driver can adjust his approach angle to the trailer by keeping the lights off with the retractable cable staying in between the contacts.