A couple ideas...
There are a variety of lock boxes out there that are similar to this one (this one is by V-Line). You could bolt it under the bed or in the back of a closet or anywhere else you can find space for it.

I have no idea what the wall structure is like in your rig but these are designed to be mounted between studs. You could then either cover it with a mirror or they actually make similar products with an integrated mirror/picture that slides out of the way
There are a variety of lock boxes out there that are similar to this one (this one is by V-Line). You could bolt it under the bed or in the back of a closet or anywhere else you can find space for it.

I have no idea what the wall structure is like in your rig but these are designed to be mounted between studs. You could then either cover it with a mirror or they actually make similar products with an integrated mirror/picture that slides out of the way

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