arthurcw,
"Does bolting one of those smaller cabinets to a wall make any sense?"
Definitely...it is a MUST.
But I wouldn't get a gun "cabinet"...they are made of sheet metal basically, like lockers in a gym or at school...even a large screwdriver may pry them open, bolted to the wall/floor or not. A safe is plate steel and more pry-resistant.
Yes, both could be battered with a sledge-hammer, as noted above in this thread, but we could go on and on how someone who WANTS to could get into your safe -- even the most expensive ones out there -- I'm just talking about something better than a closet or drawer, and showing "the authorities" you TRIED to secure your guns responsibly. Still, even a bolted-down lower-end safe would deter most smash-and-grab thieves (just try not to have tools available for them to use!).
I rent also (apartment), but I don't see why renting a duplex precludes you getting a serious (heavy) safe. Expense, yes, I can see that, but not the size or that it needs to be bolted-down should stop you.
My Liberty Presidential 25 is the small one (at almost 1000 pounds) but size-wise it fits through an average front door just fine. I suspect the larger Liberty Presidential 50 (1500 pounds) will also fit...it's the serious weight that makes moving it difficult, not that it's too big physically.
But if you wanted to "imitate" a very large bulky safe, you could get 2 or 3 smaller safes -- like the 14-gun rated Sentry G4211s (or larger) for example -- and bolt them together...which would make them very bulky to move out a door even with a dolly if they were not bolted-down (which they SHOULD be).
Furthermore, putting stuff in them to make them VERY HEAVY would also help.
In my case, renting, I have literally bullet-proof walls (mission-stone/dense concrete blocks for walls, no 2x4 framing with sheetrock) and a concrete slab floor. To drill holes in either -- and 4 large holes in the carpeting -- would be difficult and I don't want to make that an issue with the apartment manager. So I have to depend on the weight to keep it in place...and the fact that a Sentry G4211 is bolted to the Liberty to add physical bulk.
In most cases, as others have said, bolting a smaller (or lighter) safe to the wall is the best thing you can do even if renting, and you can repair the holes fairly easily when you move. A non-bolted-down safe it out the door...the "carry-out-bag" you mentioned.
So get something like a reasonably-priced Sentry G4211 (about $400...got mine online from WalMart since they were not in stock at the store) or a Stack-On (almost identical to the Sentry, probably made in the very same factory) from Sports Authority and bolt it to the wall studs. Use it NOW until you get a better safe later on and when you do, you still might find use for the first safe such as I do: The fire-rated Liberty is for my guns and other valuables/papers and stuff I put into it when I leave town for the weekend (so get a safe a bit larger than you think you need for those "extras"), but the Sentry is for ammo only...and lead ingots used for casting and bags of birdshot, all of which help make the Sentry heavier. And since it's bolted to the 1000-pound Liberty, it makes a serious monolith to move.
At least it's better than "hiding" them...thieves know ALL the places to look so I wouldn't expect that to help a whole lot.
Yes, the Sentry G4211 is not fire-rated at all, but after spending some bucks for the Liberty, I just needed a similar-sized "lockbox" for my ammo. Up until then, my ammo was just in GI ammo cans stacked in a closet, making it real easy for a thief to find and VERY convenient to move with the handles...and the 30/50 caliber ammo boxes are not overly-heavy, even if filled with ammo.
Anyway, it's a combination of things/strategies you can do that will help protect your stuff.
That, and the renter's insurance I hope you have...I do!
-- John D.
P.S. One downside of renting is the "maintenance guys" (of very dubious backgrounds) coming in every once in a while for this or that...they soon know one has a safe(s) so there is no real way of keeping it a secret here. What does seem to help is making small casual mention of what would happen to anyone caught in said apartment who shouldn't be there. So apartment staff here know I have safes and also that I am armed, and unless it's a real emergency, they do not come in when I am not here...I guess in order to avoid some "misunderstanding." Being a no-nonsense ex combat vet (with some PTSD traits) helps people understand that it really better be worth it to hit my place.
-- JD