when i was thinking of doing mine i was gonna use the spare tire mount to secure it.. basically build the box to fit without loading it, then put it into place, use the 3 bolts that hold the spare tire mount in place to bolt it to the door, then load the sub(s) in after its secured.. if you wanted to remove it, you would have to remove your subs, but theres not much reason that you would need to remove it anyway