I share many of the above comments about gasoline verses diesel engines. If I only had a TC, I would only need the gasoline engine. However once I add the 7000 lb trailer and mountain passes to my mix, I am happy to have the diesel.
The little trip we just made to the Pacific coast without a trailer could have easily been made with a gasoline engine powered truck, but it would have worn me out pulling my enclosed trailer last month to the Mohave Desert and back to the NorthWest without the diesel. We have two more long heavy mountain trips planned this year heading east plus one more heading south awaiting confirmation - All of those will welcome the capabilities of the diesel.