I realize I can't protect against theft with this method, however the point is to keep them locked up, easy to transport and protected from moisture (with desiccant and proper lubrication before storage). I know about the StackOns, but soemthing that has to be bolted isn't an option because I'm liquidating a majority of my tools as well to reduce the amount of stuff we have (and save for a few tools, they're mostly cheap walmart crap that don't work that great anyways).
Not an option as its too large/bulky. If I was going to get something that large, I'd get another safe and not bolt it down, which I'd prefer but the wife says no to another safe (yet she's okay with these cases).