whats your favorite diesel pickup

Not anymore. Cat left the on-road engine market after 2007. The Freightliner I drive has one of their last on-road engines (a 250HP C7).

They left for a few years, however not only do they make an onroad engine they make a complete onroad vocational class 8 truck:

http://drivecat.com/engines


http://drivecat.com/overview

Mind you , not that any of these are pick-up engines with CAT, but wanted to point out they are still in the onroad applications. One of the biggest problems for CAT was most heavy duty truck manufacturers now a days make their own engines and will only sell their own engines with their trucks and it left CAT with out a market to have their engines available in, their fix is now their own truck.