The German Army rode into the Battle of the Bulge on FORD TRUCKS.....
NEVER FORGET that, Ford, Rockefeller, Carnegie, KENNEDY and many more were Close Friends and Financially Supported Adolf Hitler right up until he attacked Mother Russia.
Opel(GM) also built trucks for the Wehrmacht. It should not come as a surprise that plants located in Germany would be turned to war production, as Toyota or Mercedes plants here would also be if we to conduct another WW.