For the record, I used to have an '03+ combo bar, and while it looked nice, it was a vibration machine, especially with the winch mounted. And that was just on the freeway! Mojave corrugations actually had me scared that my bumper was going to snap off and go under the truck, causing expensive damage. Once I started hearing stories about the newer combo bars stretching their accordion mounts in Oz, I decided to remove it and went to an older Sahara bar with the separate dedicated winch cradle. A much better design IMHO. The only weight on the accordion mounts is the face of the bumper itself, not the winch or the majority of the bracing for a winch. Also, the Sahara is lighter (no upper bar work), which I like.
I'm not exactly sure why ARB went with mounting the winch to the face of the bumper. I know bumpers for the 80 and other trucks do that, but those trucks also do not have accordion mounts to preserve airbag functionality, so they're still pretty solid.