My first diesel GMC 2005 fully loaded with trailer package - 2500 extended cab long box, I love it and like any body else here that has had one will probably never go back to gas tow vehicles.
I drove to and from Florida and Toronto and on the way back home I got over 1100 kilometers to the tank ( 128 liters )not pulling a trailer.
I have just bought a new 32 ft enclosed trailer and it pulled ok but when fully loaded I liked a little more power so I bought the Bully Dog kit with Outlook and I'm looking forward to installing that little option.
Duramax LLY 5 speed Allison.
Totaly love it !