gasjarvi,
I have no idea about this and I'm sure the laws vary from state to state, maybe even county to county, or town to town. But, what will happen to the tax assessment for the portion of property that is no longer being used for a farm? I know in our area, "farms" are assessed a lower tax rate but if the property is no longer farmed, I believe the owner has to pay what amounts to back taxes at the higher "non-farm" rates for the past 5 years, or something to that effect. It's more complicated than what I mentioned, of course, and hopefully your area isn't as bad as ours, but it would be something to look into as you do your planning.
As an RV'er, I like the concept, and would take advantage of such a place, but 8 miles is a bit of distance from the highway. But seeing as you are in a scenic area, it just might work out.
Good Luck, and please let us know what you find out. :)
~Rick