The car haulers have ramps to help with loading and unloading the cars. The operator lowers the ramp onto the road. Then the car is driven onto the ramp.
Modern miracles of engineering. The ramp, the lever, the wheel, the gear, and a lot of hydraulics.
Have you ever sen a van going down the road in front of you and it looks like the back end is trying to pass the front end. They used to tie them down by attaching to the frames and it would "diamond" the frame.