The only time my bike stays on my rack, in a parking lot overnight, is because I'm sleeping in the car. When I do, I use a combination of a moto chain around the frame, and wheel locks. All chain is locked to the receiver. I use the wheel locks all the time. They help with my peace of mind when driving down the freeway. Something very catastrophic needs to happen for my bike to tumble. But when I really want to secure the bike, and make it look secure, I throw on the chain.