Parking pad on a slope -- on a budget

Think I'd have a small contractor with a good endloader come in and partially level the site, backfill with good crushed gravel while compacting, and then place concrete blocks (or some sort of timbers like RR ties) around the sides to keep the fill end from spilling out. The finished product should be as close to level as you can make it so you can run the refrigerator while it's parked, or sleep in it if the need arises. Try to have the elevation of RV door close to the natural ground or walkway if possible so you don't have to go up/down much to get into the RV, and so the step can extend out when opening the door w/o getting stuck on something.