Been van dwelling for a while and have gotten past fearing the "knock". Courteously answering police questions and moving along as instructed has never resulted in a problem. As for intruders, they're more afraid of me than I am of them and invariably run off. Vehicle break-ins are a cowards crime and they're not into the hassle or uncertainty of dealing with the "Surprise". Some will argue the exception and this is why having a deterrent is worth while, but have never needed one. <br>