I have a friend who thinks that SUVs are the most dangerous vehicle on the road - mostly because of the 'roll-over scares' that he reads. I've owned several SUVs and have never rolled one over, but I have seen my share of Explorers on their sides and tops. I have yet to see the Trooper (dubbed the Tipper because of Consumer Reports) or a Honda CR-V upside down.
The star rollover "test", from my understanding, is simply a few measurements and not an actual test of how the vehicles' suspension reacts to rollover situations. So a unit with dumb struts a beam axle and the right wdth x height can get rated better than one with dbl wishbones active suspension etc.