I'm guessing that you want a lowered or stock height stance going down the road and still want to drop it when you park? I havn't installed a air bag kit on a w900 but i have installed custom springs to achieve the desired drop and still maintain load carrying capacity. If this is possibly an option contact benz spring and they can make you a custom set of springs for drop with a volvo like ride unloaded. They can make single, 2, and 3 stage springs so that pack gets stiffer as you put weight on it. I hope this helps.