I just stumbled on these and it looks like they make a wide variety of locks (including teaming up with PopNLock for our tailgates) that work with your ignition key. I guess the first time you put your key in and turn it learns your specific key and no more key chains like a janitor.
Anyone use them and have good bad or indifferent views? I would love to have tailgate and other stuff I store in/on my truck locked but I do not want to have a massive set of keys for every lock.
EDIT: I have read the threads on the PopNLock version but I am wondering more about the cable locks, hitch locks etc.