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Unlike a normal system of springs and shock absorbers, the Nivomat system works by having some of the springing provided by the Nivomats. This is why the springs are weaker than the standard ones.
The Nivomats adjust to varying loads by pressurising themselves as they work.
When the car is loaded, the suspension moves further than when unloaded. This movement activates a pump within the unit that increases the pressure of fluid within a chamber and this makes the unit harder to compress, thus raising the rear of the car. Once it is at the normal height, the units will stop pumping and the car stays at that level until the load changes again.
They are very good and effective, but their complexity means that they are also very expensive when compared with normal shockers.