More Infos about the Wilbers shocks can be found here, but only german
https://www.wilbers.de/produkte/federbeinprodukte/wilbers-ldc-nivomat/wilbers-apart.html Translation by Google:
How it works
1. The LDC Nivomat system is preset so that it will immediately catch up to the intended (defined) level position, ie about 1/3 of the total spring travel for solo operation. In this condition, the system offers reduced spring rate and damping for solo operation compared to a conventional shock absorber for maximum comfort without having to re-swing.
2. A payload by pillion and / or luggage causes the vehicle sink deep and changes the vehicle geometry negative. Here, the biasing of the spring in a "normal" strut would be necessary, but only the level position is adjusted. The actual necessary adjustment of the spring rate does not take place.
3. After a driving distance of about 300 meters under load, the LDC strut has brought the vehicle back to the defined level position. The inner pump rod has pumped oil from the low pressure to the high pressure chamber.
Due to the increased high pressure, the vehicle is raised to the defined level position and at the same time the spring rate and damping are adjusted to the load.