Found something on my accusations from earlier about GM/Opel. Also mentions Ford doing more than just sympathising
http://www.washingtonpost.com/wp-srv/national/daily/nov98/nazicars30.htm
http://www.washingtonpost.com/wp-srv/national/daily/nov98/nazicars30.htm
The importance of the American automakers went beyond making trucks for the German army. The Schneider report, now available to researchers at the National Archives, states that American Ford agreed to a complicated barter deal that gave the Reich increased access to large quantities of strategic raw materials, notably rubber. Author Snell says that Nazi armaments chief Albert Speer told him in 1977 that Hitler "would never have considered invading Poland" without synthetic fuel technology provided by General Motors.