It's been done/attemped many times going way back. It's something that offers advantages only under very limited conditions/circumstances, kinda like a Rokon 2x motorcycle. But under the large majority of situation most encounter its cons far outweigh any pros.
http://www.rokon.com/1_2_About-Rokon.html
Last edited by Looigi; 12-24-13 at 11:03 AM.