the bear II wrote:
A concrete pad would be a good idea but not needed.
You do want to support it so consider using the type of leveling jacks used on mobile homes.
Most folks find skirting around the bottom of the RV helps to keep the critters and cold out.
Since you are green (eco) you might consider solar and or wind power along with some sort of rain water catch system. Many of the websites that cater to "off the grid or survivalists" will have great tips for you.
Had to laugh a little, OP said they were "green" to RV ownership, not ECO GREEN.