I have a 30' TT. loaded weight is just under 10K. My TV is a 2016 2500HD 4x4 CC standard bed 6.0L, 6 spd. auto with 4.10 gears and tows it fine. If I were a full timer and traveled a lot I'd have bought the Duramax for better mileage. But for the half dozen times a year I tow the TT plus I use the truck as a daily driver I couldn't justify the added cost of the diesel package.
The 6.0 likes to eat, I get between 8-9MPG towing and 14MPG empty with a good tail wind. A previous TV was a 2006 2500HD with Dmax / allison and got 19-20 MPG empty and 14 towing a 7500# trailer. Sorry I sold that one. I don't think the new Dmaxes get that MPG. For a TT I like the standard 6'6 bed if I had a FW I'd go with 8'.
