Some people obviously don't mind living on a floor which is off-level. See the angle of the motor van in my picture! For me, it would drive me crackers. I need the floor level. My practice is to reverse onto the pitch, quickly check for level across the axle on the drawer unit just inside the caravan door, then if one side requires lifting, place a yellow ramp behind the wheel and reverse up the ramp. Place a block to the front of the wheel and I unhitch the van. Fore and aft level is done on the jockey wheel using a level against a moulding strip on the van.