Quick tip I find useful, always back up the ramp, either using car or mover. That way , as soon as the handbrake is applied, there is no more movement.
If you pull up a ramp, the brake won't hold when you disconnect because of the over-run brakes. OK if you can lock with a chock but I've found there is always a slight movement back down the ramp. But then I'm a bit OCD about levelling! You see a lot of caravans on site who clearly don't bother.
If you have a mover, you can use the mover on the opposite wheel to straighten up the unit without affecting the ramped wheel.