Last season I used a Bones rear rack. I had two of the straps tucked inside the trunk so it was harder to remove the rack without opening the vehicle. I then wrapped a fairly decent rubber coated chain and lock thru both the bike and around the rack. It would have been a bit of a hassle to try to steal the bike (unless of course the thief came prepared with a bolt cutter). I left it parked in various places around town for hours at a time and no one ever messed with it.