GraniteCrystal, Jeep is looking great!
I also have the LOD destroyer front and rear bumper arriving any day. I asked them to send mine with blacked out logos so I think they are making me suffer for it ;-)
Regarding the issue you are having, below is a copied quote from LOD on another forum replying to this very question but please do keep working on a solution as I may "borrow" your fix for my bumper ;-) :
" From LOD: Hey guys, the destroyer tire carrier is linked to the door, so the door keeps the tire carrier from opening too far and hitting the body, pretty simple. The reason we do not put a lock system on it to hold it open is because people forget on the door linked systems that its locked and can figure out why it won't close and start shoving on the door trying to close it, and with all that leverage of the tire carrier and door it damages the locking system. On a door linked system with a lock you have to walk around the door to the passenger side just to release it and people often forget especially if someone else is getting in the back of the Jeep, they can't see the lock and start yanking on the tire carrier damaging the locking mechanism. We have learned this from much experience, so the Door linked tire carriers that open with the rear door will never have a locking mechanism on them for that reason. Hopefully this makes sense, let us know if you have any questions and we will do our best to answer them."