Tires dont spin.. since 4 lo is even a lower ratio than 4 hi so its even harder to rotate the tires therefore causing the jeep to stay put and not roll off the jack while its up... 4lo and 1st gear and handbrake does it for me.
If you put in in 2wd when you lift it up your front tires should be able to spin which will only make it harder... imagine you are changing rear tire or whatever and the front is the only good anchor, with the tires able to spin since no front handbrake it can roll off
i've seen a car roll off a jack once on a person doing brakes.. outcomes were nearly cutting the persons foot off and possibly arms (good he felt it move back and backed away) and new rotor since it was damaged in the fall
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