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I would go with Rubber Duck 4x4 if going for a slantback rack.
http://www.rubberduck4x4.com/store/pc/Hummer-H1-Bed-Accessories-Racks-c60.htm
You can see it in action with this H1 rollover at Moab.
https://www.youtube.com/watch?v=chCmbKp2bkY
owner says Rack was fine and minimal damage to truck...