Originally Posted by Arnie
Basically, if you run a fuel level different to what you cornerweighted at you will affect the balance. If you have a passenger, you will affect the balance. If you carrry home a load of groceries, you affect the balance.
More effective? Not at all. Proper coilovers that do not have the dual adjustable bracket use helper springs. There is no preload that is being changed when you adjust the ride height. One argument manufacturers use for the dual bracket setup is that you "maintain full stroke regardless of ride height". That is true, however the majority of these dual adjustable's have so little stroke to begin with that its a moot point.
Again, my car isn't a DD, but I see your point.
I disagree about the preload statement though. Any time you change the height of the lower spring perch you are changing preload. That's why some manufacturers put the helper springs in there. When you lower the perch to lower ride height, the helper spring keeps tension so the main springs don't come out of their seats when the suspension gets unloaded on those bumpy roads everyone mentioned in this thread.