I hear ya. I'm just going by the difference between my 13 with 5.3 and my 16 with 5.3, both had the 6spd.
Very close to the same truck only difference was gear.
Don't get me wrong it's great with the trailer in town, and it's incredible with out the trailer.
But the trailer over 90km hr is like a big ass parachute. The trailer is a tandem axle 14' 7wide 7tall weighing in at 5000lbs average day.
My average in overall ownership is very close to my 2013. Better when not towing but pretty crappy when you have to tow distance.