[Dirty Harry]

Before driving on, the back of the ramp is lifted with a floor jack, the casters are removed, the pedestal that holds up the back of the ramp folds up, and the back of the ramp is then lowered to the ground. (That's how you get the car on and off the lift.) The weight of the car pins the back of the ramp in place while you drive off and back on. Once on, your floor jack then raises the back of the ramp, the pedestals hinge back into place and you slide the casters back in before lowering the floor jack. Once you're used to it, you can do it in one to two minutes, and I've never had the lift hint at moving while I was pulling on or off. While the front of the lift is still on casters, the back is held firmly to the ground by the weight of the car. Perhaps if you drove onto the ramp at some unwise speed and slammed the brakes, you might get it to move a little. Seriously, though, not a problem.