FILE - In a Wednesday, Feb. 8, 2012 file photo, Jeep introduces the Jeep Grand Cherokee during the media preview of the Chicago Auto Show at McCormick Place in Chicago. Sales of Jeep

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FILE - In a Wednesday, Feb. 8, 2012 file photo, Jeep introduces the Jeep Grand Cherokee during the media preview of the Chicago Auto Show at McCormick Place in Chicago. Sales of Jeep Grand Cherokee and Dodge Durango SUVs are so strong that their factory will stay open through the normal 2012 two-week summer shutdown. Automakers typically close plants around the July 4 holiday to update cars and trucks for the new model year and maintain the machinery. (AP photo/Nam Y. Huh, File) less