When we camp we like to explore and make the occasional trips to the groceries to pickup the essentials. We usually leave our rig behind and having a secure way to lock is crucial. There are many products out there that vary from price and security. From our research there is nothing out there that is bullet proof as anything with a lock can be broken into. In reality its just what an you get to make it harder. Our choice was the RV coupler locks from Proven Industries. This thing is solid and had quite a bit of weight. The design allows you attach the chains and have them locked in the coupler. we like this and feel that its the best for our rig. It’s definitely Pricer than other models but we believe its worth it.