It would be rare to find a campground sloping so much to one side that the 8 foot long axle needs to be propped up more than about 3". But I see from the pictures above that it can happen.
Most of the time I find that I need to raise the front or rear of my motorhome by several inches, while side to side is normally within a couple of inches of being level. This is because my wheelbase is 190" (a little over 15 feet" while the distance between the tires is a little under 8 feet.
I was camped next to a person in a fifth wheel at a level parking lot in Huntington Beach CA. IT was sloped only enough to prevent water from puddling on the paved surface. They felt the need to put 3/4" plywood under one of the front jacks in a attempt to 'level' it. Really you do not need to be that level. The refrigerator needs to be somewhat level for ammonia water mixture to return to the boiler, but does not need to be 'exact'. Your bed needs to be somewhat level, or at least the headboard side higher than the foot side to sleep well. Other than that, you are level enough. Walking around inside the 10,000 pound vehicle on springs while shifting 400 pounds of passengers from the dining table to say the other side of the space will cause it to sway a tiny amount anyway.
Good luck,
Fred.
