@Max1900
I didn’t realize that it would be mobile.
In that case I suppose it could be considered similar to a mobile home and subject to regulations that apply to campsites.
You could make it entirely off-grid and self-contained, I suppose, by having solar panels, a backup generator, composting toilet and a potable water cistern.
A good composting toilet would save a lot of money but you would have to make it very plain to guests how it works and you would probably get a lot of complaints anyway.
Same thing if you put in a well with a hand pump to fill the cistern.
None of that would bother me if it was in a remote wilderness location, but I lived that way for years, and I’m not sure how many other people would be able to deal with it.
There is a fairly recent phenomenon known as “glamping,” and I hear that there is a demand for such listings, so you might be onto a good idea.