Bruno, the red truck here was a cf 6000/7000/8000, I used to work on them alot before I retired, the 6.6 is a good motor, those trcks could also be had with a catapiller or cummins motor. Forn no longer builds truck of that size in the US, they sold there US big truck division to Freightliner.
here is what the freightliner version looks like
http://i51.photobucket.com/albums/f3...elift_USPS.jpg