that sucks! sorry man.. not sure if OEX down in San Diego does this, but I know the OEX in Sunset Beach has the Malibu Parking Lot Sale a few times a year. Pretty awesome deals, I hear.
I sometimes load my big tandem kayak on my car the night before I fish, and always worry about someone coming along with a truck and jacking my stuff. I put this tiny alarm inside the hatch. If anyone moves my kayak, the pieces will separate and make a loud piercing alarm sound.
They are very cheap, small, and pretty darn loud.
http://www.amazon.com/Doberman-Secur...doberman+alarm
