Per Wikipedia "an anti-sway or anti-roll bar is intended to force each side of the vehicle to lower, or rise, to similar heights, to reduce the sideways tilting (roll) of the vehicle" using the principle of a torsion spring not associated with the vehicle's leaf springs.
Per Torklift, a Stableload "pre-activates the stabilizing effect designed for rear springs by keeping them actively under load" or uses early spring loading to tranfer the increasing load on the outside turn spring back across the rear end assembly to the inside turn springs.
My understanding is the two technologies work interdependently to basically achieve the same thing. So is using both better than using one? And how so?