content: Something like this would be required - http://www.waimea.co.nz/sites/default/files/gallery/pm-30sp-truck-crane.jpg Here they're trying to pull the rear axle slightly downwards - it's a direction in which it is never supposed to withstand any higher forces. It handles forces acting upwards (due to the car weight), front and backwards (accelerating or breaking), and towards the sides (sharp turns), but under no conditions it is supposed to handle a force which tries to rip it out from the car.