And while you are having to level the van you might have to get it up on a ramp so the Alko wheel lock receptacle is aligned exactly to take the lock. Easy if side to side is level .... but virtually impossible if you have to run one wheel up inclined chocks. The art of compromise.
The technique, for SA vans, is not to use ramps or any incline, but a set of three decking planks to stack one on the other as needed, but end up with a level surface able to accommodate enough lengthwise wheel positioning.
Place these along side the tyre, placed where judged the wheel will end up in a viable place for the Al-Ko.
Motor forward enough to be able to slide the stack into the wheel's track, then motor back onto the stack. Place spirit level up the van's vertical side directly in front of you knelt by the wheel for checking the receiver's alignment.
My planks have 45 deg chamfered ends.
All comes pretty straight forward, no need to unlock the door and chase that "level" bit inside.
If I would need more than three planks, then the awning will not fit, the step present too much danger and for us it not be a viable pitch.