I think that if you mounted two sway bars to your frame and axle you would increase the spring rate, but I don't think that clamping them together with achieve the desired results because the ends are not fixed on one of the bars. Hose clamps don't really prevent the twisting of a round bar, so I would expect one to move relative to another. Really though any sway bar (stock, Currie, whatever) is miles ahead of no sway bar on the road. It is not like we are driving sports cars here.

Harry Wagner
Harry Situations
4x4Wire's Toyota Section