probably late to the party, but I just found out about this engine intended for use in the 1/2t trucks:
http://gmauthority.com/blog/gm/gm-engines/gm-duramax-3-liter-inline-6-cylinder-turbo-diesel-engine/
http://gmauthority.com/blog/gm/gm-engines/gm-duramax-3-liter-inline-6-cylinder-turbo-diesel-engine/
