I had thought about the tuffy box as well, but my concerns were that for one, i wanted something that was un-obtrusive, if I were to glance in a window and see a tuffy box it would tell me something of importance is in there, which somewhat defeats the purpose. Also there are some things lost when you go to a plain locking box. there are several small gun vaults that will fit under the seat but they are difficult to access. If all you need is a lock box, you could take a standard ammo box weld one side to secure the hinge, notch the bottom to allow a hasp through, which is mounted to the floor somewhere. then the box is locked to the floor as well as the lid is lockable, we do it all the time in our Humvee's.