...any other manufacturer in Germany produced pretty much every item you can imagine for warfare.

Lets see: Tanks, tank engines, trucks, cars, Diesel engines for Dora, Berta and the other mortars used in the east.

Also we do have aircraft engines for the Messerschmidt. BMW for example produced aircraft engines, too. For example for the Junkers JU 52.

Just for the records: The german subsidaries of Ford and General Motors (Opel) build trucks for the Reichswehr. The revenues off course went to the shareholders, at least in the beginning of the war.

This is just part of our history. Same story as with your Boeing-planes spraying agent orange over Vietnam or british and french trucks carrying soldiers in Africa.

If you look at Germany during WW II you will hardly find any company which wasn't involved in some kind of wartime production.

Kind regards
Eberhard