These guys are the industry leaders in establishing methods to control bedbugs. Not located in California, but it might pay to call them for a referral to a more local company that follows their protocols.
The cool part is that they train dogs to be able to detect as little as ONE bedbug egg, so they know where to concentrate the effort!
Better to use them than some home remedy that may have you breathing/eating insecticide everytime you go in your camper for months to come!
http://www.plunketts.net/bed-bugs