Thank you for the great response Dutchmen, I completely agree with you. What I am hoping to do is definitely a challenge, however, since the units are mobile I can choose a county where zoning laws are a bit more relaxed (this will obviously take a TON of research though).
Even though we would be "running a business", it is still through Airbnb, so you are covered on most insurance and all you have to pay is the hotel tax, if I'm right. The great thing about Airbnb is it allows anyone to be an entrepreneur and rent out their units. Also, I would be reviewing tenants as they would be me, so I can make sure we don't have any sketchy sex offenders staying in the units.
Does anyone know any counties in California that have more relaxed zoning laws? Or, any other opinions on how this may work without actually having to purchase the land?