Zundapp Ges, GmbH of Nuremberg (Germany) were founded in 1917 and were a motorcycle manufacturer though from 1928 - 1935 they made a number of 3-wheelers that incorporated a motorcycle front with a number of rear sections that ranged from open and enclosed passenger vehicles and also in 1933 a trivan.  All were powered by either a 400cc or 500cc Zundapp motorcycle engine that drove both rear wheels.

The company went bankrupt in 1984 and closed.

The Zundapp CZ (My thanks to David Jůuza for this picture)