Last year's 19-foot coupe concept loses its roof. Last year, Mercedes wowed us all with an electric coupe concept it called the Vision Mercedes-Maybach 6. While the name was a bit of a clunker, everything else about it was pure elegance. It was nearly 19 feet long, almost all hood, and rode in silence thanks to its electric powertrain. The Vision 6 is back at Pebble Beach this year, this time without its roof.