If the arm in the picture could bend, the magnet would just stick to the front bumper
What if the magnet was of similar mass to the truck? Assuming it could be made to balance, maybe this actually might work to move the truck such that it meets the magnet in the middle. Then the arm could slide the magnet upwards to detach, reposition it, and repeat. Of course, there are much better ways to make a truck move, but maybe it could work?