Spare tire mount

[jsbihn]

Hey all,
I am curious about this.
I see the factory spare tire mount as a swing rig that is attached to the rear bumper. And I have seen other aftermarket setups like that also.

So why hasnt anyone mounted the spare directly to the rear hatch?
I have seen plenty of other SUV's around with them factory mounted to the rear hatch or door, so why cant we?

Has anyone tried it?
Can the hydraulics of the hatch not support the tire weight?
I understand that the handle would be blocked, but that is just a reposition or rewiring of the release mechanism (maybe even setting it up as a remote actuator?)

Any comments?