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A rollbar is mounted to the chassis, a lightbar is mounted to the body. If you "truss/reinforce" the body to the chassis, you can count it as a roll cage. If you can figure out the best place to mount it to the chassis. Most commonly they are mounted just inside the hard top directly down from where the fiberglass & metal top meet and to the angled part of the wheel well.
You may also want to check out http://www.artmorrison.com , they offer some sweet full cages for the blazers. If I remember correctly you can get a 8 or 10 pt. roll cage for $280!