You know the story: you are at a camp site or you are making a short stop at a beautiful spot along the road, but your Motorhome or camper van is rather uneven. So uneven that the available levellers are not enough to put your Motorhome or camper van in a more or less even position. So you try a few more planks, another jack, etc. After you have done this, you can at long last enjoy your rest, but then you want to move on again and at the next stop it will probably be the same story all over again. A time-consuming activity that gives a lot of trouble.