I put the jack pulled on the tow bar of Van and also extended LED magnet vertically on the front of the coupling claw of the trailer. Now you can reverse drive up to the trailer to the rear window both bars stand side by side 10 cm. Now you just have to let out the clutch to make a difference to one side and engage. Man, this tool can also be equal in the car, because something always falls between switching tunnel and seat rail and can werden.Mit retrieved only with this tool again to the mirror you can check the chimney or pipe continuity sometimes even.