I have my new pontoon sitting at our Lake House that is 100 miles away from us. It has a lock on the trailer but I am searching for a better one. Does anyone know the best lock to use on a pontoon trailer that has the squared off coupler (I think that is what it is called)? I am afraid my big investment is going to get stolen if I don't get it protected more. Below is a picture I found on the internet that is similar to the squared off front of the trailer. Thanks for the help.