There is a complicated set of assumptions that go into calculating demand.

Some counties in Virginia loves them because they have little employment so no big population increase = more burden on schools and the tax basis is very high because of the personal property inside of them so they pay a lot in taxesAs you mention need to be near a power source and I spent 5 years trying to get one approved in 30 acre parcel that the county wanted the site for something else - so they can be challengingTo get zoning approved

For this plan I followed the outline in The Ultimate Beginner's Guide here on the site.  

It was also $900 a month and very complicated.

@Bruce Woodruff I have built several unique stays already www.cameronranchglamping.com and some other more basic glamping sites.

If you served you can go into the VA.gov site and look for your COE and/or apply. 

On the site, the "Learn" link across the top navigation bar has lots of great info, and so do the forums.

I also really like RETipster's site.

The risks, such as triggering a "due on sale" clause and complicating your taxes, often outweigh the benefits. 

We used a combination of Wayfair, thrift stores and online second-hand sale sites.