Might as well add to the speculation, ;-).
They originally had the PSC Brawler II rear bumper on there, the newer one that connects to the tailgate for the one handed opening. I have the original Brawler rear bumper with a more traditional separate bumper mounted carrier and while it's a nice piece of kit, the carrier triangle on mine wiggles and flexes a fair bit with even a 37" tire.
Always wondered how much added stress the new style tailgate connected carriers like the Brawler II transfer to the tail gate sheet metal and if the switch to the frame mounted carrier is related or just me making shit up? ;-)
View attachment 98599