If you cheap out and it's just an ill defined grassy area, they will park where they like and that usually means keeping as much space on the passenger side as possible.
- Best bet is a clearly defined LEVEL pad of gravel or concrete. If it's there people will typically at least keep the RV wheels on it.
- Unless it's such a large park that it's difficult to find the site, an "escort" will annoy me more than anything. Especially if they try to help guide me into the site as that only messes up our process but if there is damage they won't be paying for it.
Really if everyone is offset 4' to the left...who cares? If that really limits the neighbor, it likely means your sites are too small.