It depends on how much you like living in an RV. They are small. It is like living on a boat. You trade the lack of space for the coolness factor and mobility. Plan to get rid of a lot of stuff and put the rest in storage. My brother lives in a motor home on his property. He house sits for people and relishes all the room and convenice of a regular house even it just for a few weeks.
For a short term stay in CA of 2-3 in a hot real estate market, the other good idea would be to buy a house that needs some work, and plan on doing some sweat equity by fixing it up. You would be flipping the house, and make some money for the next RV.