A tractor controller of a tractor in a tractor-trailer vehicle train comprising: a processing unit comprising control logic, wherein the control logic is capable of: receiving a tractor GPS value that indicates a tractor controller location of the vehicle train; wirelessly receiving a data signal in response to a towed vehicle controller (70, 80, 90, 100, 110) receiving an electrical start signal, wherein the data signal comprises a unique identification that corresponds to the towed vehicle (16, 18, 20, 22, 24) and a towed vehicle GPS value that indicates a location of the towed vehicle controller (70, 80, 90, 100, 110) of the towed vehicle (16, 18, 20, 22, 24) of the vehicle train; and calculating a position of the towed vehicle (16, 18, 20, 22, 24) in the tractor-trailer vehicle train based on the data signal received, characterized in that the control logic is further capable of: wirelessly receiving a second data signal associated with a second towed vehicle (16, 18, 20, 22, 24), the second data signal comprising a second towed vehicle GPS value that is different than the towed vehicle GPS value and a second unique identification that is different than the unique identification; and calculating a second position of the second towed vehicle (16, 18, 20, 22, 24) based at least upon the towed vehicle GPS value and the second towed vehicle GPS value received by the tractor controller, wherein the control logic calculates the second position of the second towed vehicle (16, 18, 20, 22, 24) relative to the tractor based at least upon the towed vehicle GPS value and the second towed vehicle GPS value received by the controller. a processing unit comprising control logic, wherein the control logic is capable of: receiving a tractor GPS value that indicates a tractor controller location of the vehicle train; wirelessly receiving a data signal in response to a towed vehicle controller (70, 80, 90, 100, 110) receiving an electrical start signal, wherein the data signal comprises a unique identification that corresponds to the towed vehicle (16, 18, 20, 22, 24) and a towed vehicle GPS value that indicates a location of the towed vehicle controller (70, 80, 90, 100, 110) of the towed vehicle (16, 18, 20, 22, 24) of the vehicle train; and calculating a position of the towed vehicle (16, 18, 20, 22, 24) in the tractor-trailer vehicle train based on the data signal received, receiving a tractor GPS value that indicates a tractor controller location of the vehicle train; wirelessly receiving a data signal in response to a towed vehicle controller (70, 80, 90, 100, 110) receiving an electrical start signal, wherein the data signal comprises a unique identification that corresponds to the towed vehicle (16, 18, 20, 22, 24) and a towed vehicle GPS value that indicates a location of the towed vehicle controller (70, 80, 90, 100, 110) of the towed vehicle (16, 18, 20, 22, 24) of the vehicle train; and calculating a position of the towed vehicle (16, 18, 20, 22, 24) in the tractor-trailer vehicle train based on the data signal received, characterized in that the control logic is further capable of: wirelessly receiving a second data signal associated with a second towed vehicle (16, 18, 20, 22, 24), the second data signal comprising a second towed vehicle GPS value that is different than the towed vehicle GPS value and a second unique identification that is different than the unique identification; and calculating a second position of the second towed vehicle (16, 18, 20, 22, 24) based at least upon the towed vehicle GPS value and the second towed vehicle GPS value received by the tractor controller, wherein the control logic calculates the second position of the second towed vehicle (16, 18, 20, 22, 24) relative to the tractor based at least upon the towed vehicle GPS value and the second towed vehicle GPS value received by the controller. wirelessly receiving a second data signal associated with a second towed vehicle (16, 18, 20, 22, 24), the second data signal comprising a second towed vehicle GPS value that is different than the towed vehicle GPS value and a second unique identification that is different than the unique identification; and calculating a second position of the second towed vehicle (16, 18, 20, 22, 24) based at least upon the towed vehicle GPS value and the second towed vehicle GPS value received by the tractor controller, wherein the control logic calculates the second position of the second towed vehicle (16, 18, 20, 22, 24) relative to the tractor based at least upon the towed vehicle GPS value and the second towed vehicle GPS value received by the controller.