Now that I have had a closer look on the original pohoto, I have to say, that most likely I made a mistake.
This vehicle stood on a stand with other vehicles.
Now I´m sure it is
NOT a german vehicle. Sorry.
The company we are looking for has produced both passenger cars and trucks.
I would suppose, that it is very likely that this one at least used the front part of a passenger car, buzilt on a light truck chassis.