The last remaining cars from a once-popular automaker left at its main production facility are heading to auction More than 75 years after the first mass-produced Saab was completed at the Trollhättan factory, the final cars remaining at the site are heading to auction.At its peak, the Trollhättan factory, which is located around 50 miles north of Gothenburg, Sweden, had around 10,000 people working at the site.Several million Saab vehicles left…