[CORattler]

I replaced all of my CH751 keyed locks (except the water fill door and the front leg/rear stabilizer control door) with the round "barrel" keyed locks. I was able to order them all keyed alike. The only "drawback" with this type of lock is that the key remains in the lock when in the unlocked position. I solved this by buying one of those key chains where you can separate it easily (like what is used to leave a key to your car with a valet) and put one key on each end.
Sorry, I can't remember the size or where I got them from except is was online. Here's a link from Tweetys that shows the kind I bought. I believe Tweetys will ensure that what they ship you are all keyed alike .... just call them and ask. http://tweetys.com/ace-key-baggage-locks.aspx