Well, the OP has never been back to expand on his situation.
But if this a piece of private property, and the RV is to be there permanently, hire a guy with a suitable piece of equipment and level the entire spot appropriately and create a pad with drainage. If possible install electric, water, and septic. Maybe even build a deck.
Set the RV on blocks, remove the tires, and install skirting.
If you are going to do this, do it right.
Scott and Liz - Southern NM
2012 Wildcat Sterling 32RL - w/level up (best option ever)
2007 Chevy 2500HD 4dr short bed Duramax w/allison
Reese Fifth Airborne air ride king pin coupler with Sidewinder