what bike lock to secure rack and bikes to car?

dee999
dee999 Posts: 11
edited September 2008 in Workshop
we travel to a lot of races, and our bikes are locked onto our rear mounted cycle carrier, and the rack is locked onto the car tow ring with another lock. :?
i am concerned that our bikes probably wont be insured if they got nicked off the car, as the locks are just run of the mill plastic coated chains with integrated locks. :cry:
what does everyone else use or recommend? gold rating ones seem mega expensive, and mega heavy to connect to the car! :oops: