Umm I dont think that is correct every bar has the same spring rate at the stock ride hight but once said bar is twisted to the point on passing its spring rate yield thresh hold and heats up to much and looses tention. And if not loaded proper it wonte have the stored energy to work properly

per load is for setting up a proper spring rate and t tee bar needs to be loaded thus why when ever
Ever you change a t bar you have to change the other side too ina keyed type truck. but we have no keys so that makes life nice for the guy that wants to chnage one but.... his spring rate is different on both sides even thou there but at the same ride hight

its called doing z axis when alinine a trucks suspension if not setup right you eather going softer or harded