I rented to students, and ended up focusing on law students, but I rented tiny studios to them. 

Just know, though, that landlord-tenant law is a very tiny bit of state code and very easy to learn and pretty much anything to do with landlord-tenant law can be done in small claims court, and even that's rarely necessary - if you just take the time to learn that tiny part of the law, even if you aren't a lawyer, that has to do with your business.

I built this house as a sort of tiny cabin and figured that if I were to upgrade someday (which seems will be the case now) I could rent it as a themed cabin getaway on there. 

You will be driven crazy, and you will also be the punching bag for every tiny thing that goes wrong.

For instance, in CA when it starts to rain, you will often be invaded by these tiny ants we call cement ants - they usually live under sidewalks or cement porches, and when their ant condos get flooded, they invade your home.  

I think it will most likely be self-policing.I rented tiny studios in a 26 unit building and most of my tenants were grad students, once we found our niche.  

The garage was used for office and I just added a bathroom and tiny kitchen.  

I also came across code regarding adding a tiny house on wheels, which Fresno allows, which is totally cool - but, it says it can't be separately metered. 

Account Closed Tiny Homes on Wheels are an excellent option!

Is there a closer place you could park and RV or a tiny house?