Hollywood tough guy and politician Arnold Schwarzenegger is famous for his brawny physique and fans can now bid at auction for an equally robust Unimog go-anywhere truck he used to own. The silver and black 1977 Mercedes-Benz Unimog U1300 SE pick-up was previously used for several years by the star of the "Terminator" films. The vehicle is powered by a 6.4-litre in-line six-cylinder turbo-diesel engine paired with a manual transmission and the cockpit carries his signature written in indelible b