I put a good amount of thought into anything I design/mod/fabricate so this was no different. The Rebel bed is smaller than the bed on our 2500. The spare tire mount is relatively easy to remove when we need the room like for when me and the wifey go out to the desert and go shooting. I used two steel plates that are 1/2" wide and runs the length of the mounting holes for the front and rear "feet" for the and welded 4 nuts to the plate. The bolt head in the pix that sits in the lower portion of the bed ridge holds the plate in place. So when I wanna remove it, I'll unscrew the 4 bolts that hold the mount to the underside of the bed and then I can remove it. The four lower sitting bolts won't be removed (I covered those in 2 coats of red loctite) and the plate will stay in position under the bed, ready to be used again when I wanna reinstall the spare tire mount.
Bringing into account that this bed is crazy small and couple that with the 6" lift, if I need to go to Depot or pick up something that wouldn't fit in, I'll hook up my 20' enclosed to handle the task.
To avert any potential theft (I had this same setup for 20 months with no probs) the wheel is locked to the mount with a steel cable and padlock. In addition, the manufacturer supplied a 32mm nut that is under the top threaded hold down which holds the plastic centering gizmo so the wheel doesn't move. So if someone wants to swipe my spare, they'll have to not only have some sort of cutters but a gargantuan crescent wrench, try to pull it off relatively on the DL and if it's in front of my house, not alert my 105 pound American Bulldog which will allow me sufficient time to confront the thief with one of my 2A items. Worst case, I got insurance.