If the property attracts mostly less-than-perfect tenants, increase the security deposit if law allows. 

Is there interest in the house from buyers that would make it attractive for the owner to owner finance?

Triple net is attractive at some point as a very passive, if modest return, investment. 

So while it's not as attractive as fully amortizing 30 year loans, it's still long enough for you to lock in a solid rate and have that rate fixed for a period of time until your balloon period.

As such, you may inherit liabilities from investors who are attracted to such deals with ill intents.  

This is nowhere close to an attractive proposition from an investors standpoint.

I am definitely starting to get attracted to other parts of the country now though, as I see a lot BP'ers are are doing great in certain places. 

But if I hadn't known his goals, it would have been difficult to have suggested a relevant solution like seller financing to him.One last thought: they may say that they don't have the willingness to provide seller financing, but if you show them the alternatives (which might not be as good), and the benefits (which can be fairly attractive), they may change their mind.

What attracted you to wanting a rv park? 

You may want to try and focus on finding attractive pockets of neighborhoods in Center Township.