Frank, that's the truck from this team, backed by Groine Development:
http://www.dakar.com/2005/us/competitor.oft?service=DRaceServer&RaceType=DAK&RaceYear=2005&PersonName=378
I see about 10 Unimogs started. 6 ML430. 2 G270CDI. 8 Actros.
http://www.dakar.com/2005/us/r1_partants.html
Robby Gordon won the first stage, on a Race Touareg. That's his very first Dakar, first time racing a diesel, and first race in Europe as far as I know. He says it's easy to drive and flies well.