I bought a used Yukon XL 2500 to use for towing and sold my newish Duramax dually. We might tow to a show 2-3 times a year. Never more than 6-8 hours one way, usually less. The dually
was very nice and would tow like a dream but we never used it for anything. Too big and too much coin tied up just sitting. The Yukon is a lot more useful for everyday stuff and even though as Rodger pointed out it only has the 6.0l gas burner, I've programmed and exhausted it up to respectable performance. Plus it has 3/4 ton chassis and
brakes and the 4l80E with all the extra coolers and cooling. I can load all the gear (chairs, coolers, canopy)
inside and not have to worry about that stuff being exposed in the open bed.
It also has the Quadrasteer. If you've never driven one, they are a hoot! It makes a lousy trailer backer like me look talented!
Jeff-