I have noticed an effort to legislate this type of living arrangement out of existence.
I'm not the only one to note this and this article gives a general overview of the current situation:
http://offgridsurvival.com/federalgovernment-outlaw-tiny-homes/The article contains a number of links to supporting articles and reports. I would recommend following these links for more information.
Note especially how this action will effect living in remote cabins and RV setups.
This is NOT a good thing...
[edit] read the comments after the article.