Excellent product, very pleased, ordered direct from Wilbers in Germany as cheaper option.
As others have said they will build them to whatever spec. you want, but it depends on the operational range you want. If one end of the spectrum is rider only no luggage and the other end is two up fully laden then that is a lot of range for any suspension to cope with, especially if you are wanting something erring towards soft as the solo option.
You may need to spec up some slow and high speed compression damping in addition to the preload but the more adjustability you build in the harder, in some ways, it will be to tune the suspension to how you want it - although you will have more choice.
My Wilbers are certainly firmer than my stock 1150adv shocks, but then that's what I wanted.