I'll stick my neck out here and agree with Jerry about leaf springs. Twisting them (ie, when articulating) makes them stiffer so they resist flexing much more than coils do, and they are less likely to require a sway bar. People with leaf sprung crawlers have gone to great lengths trying to reduce leaf twist and allow more articulation.
Are you going to explain how the antisway bar locates the axle and defines its travel path despite the coil springs being unstable in all directions? No one has done that yet.
And while you are at it, why did Jeep put a track bar and an antisway bar in the YJ if leaf springs are so stable? Even the CJ7 had an antisway bar.
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