Second that. It is always enlightening to ME students in the first design course that the metal in a coil spring twists instead of bends. A coil spring is really just a coiled torsion bar. However, it fails sooner under the same torsional load because it also must carry the weight as a shear load. In Mopars, the front end weight is carried by the LCA bolt, so the torsion bar is loaded in pure twisting, meaning it can be lighter. Plus the mass of the spring assembly is at a lower installed height, which improves handling.