I actually did this the other day, just have been too busy with work, Happy New Year!
Santa brought me some new replacement cam locks so now I do not need to worry about the crappy old CH751 keys. I was not really too concerned about security per se, but they put the cheapest and junkiest of all locks on there trailer. I was not ever really happy with how they worked and seemed to get jammed up. Now I do not need to worry about it.
Locks were ordered from CH751.com. They are a bit pricey maybe but I think they offered a good product. I guess this season will be the test of how they hold up but I already like how well they operate to lock and unlock. They seem of good quality and the lock mechanism is very tight (in a good way).
Install took about 15 minutes for the first one. Then 5 for the rest. I took more time to figure out how to put them in place to make sure they opened the correct way.
Trailer is winterized and stowed at the house for the winter so I will see how they work out for the 2016 season.