So we have to revert to oko's DKW Schnellaster.
That's going to be a difficult one!
10 of these vans were assembled and marketed in Finland under the brand-name Donau-Sisu; the question is, were they called Donau-Sisu Schnellaster or just Donau-Sisu? I can't quite get to the bottom of it! One survives but I haven't been able to find a picture of it to see if it wears the Schnellaster name..