While I agree with the traditional science you are giving here the first use of montube shocks may have neccessitated a new inexpensive solution to deliver a more roll resistant ride. As the VX does not begin to really press the spring helper into action until the slower-moving ultra stiff shocks and coil spring begin to emote dynamic force on them. All I'm proposing is that this is a new system of vehicle behavior, especially in conjunction with the introduction of full-time torque on demand. It's a whole new pitch and yawl situation the engineers are dealing with. At any rate you have to agree that the close proximity of the spring helper to the axel is a little bit unusual, to say the least, and there needs to be a reason for that. Bump stop duty alone just doesn't seem to be reason enough.