I have to agree with Effy - this topic comes up every time you turn around. Just to note, someone had said it depends on your home state's rules and whether or not they require a braking system. It also depends on any state you intend to drive through. Regardless, what if the vehicle comes lose? It's not going to stop itself without a supplemental system in place. For our Wrangler, we went with the Invisibrake and love it. Out of sight, stays in place, doesn't eat the battery alive. Whatever you do, definitely put something on it.