The CH751 lock is common across most brands of RVs, not just Keystone, or Montana. I believe it even extends beyond the RV industry to some tool boxes and other items.
Certainly, you can change the locks if you want to, but don't forget the doors themselves are not all that strong. If someone wants to break in, I would just as soon they used a key, rather than smash open a door. My impression is that campgrounds themselves are usually pretty safe, but I might have concerns about parking lots and storage yards.
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