Wow, talk about "hi-jack".
Like a couple of others I will answer your question.
I'm a CHEVY owner, not Ford , Dodge or Toyota. I have an '09 25000 HD cab 1/2 Z71, 6.0 w/ 3:73 gears. I pull a 2014 Keystone Sprinter 5th wheel, 269FWRLS wide body. It is 32.5' long, dry weight 8739#, GVWR 11,833#, pin weight 1670#.
Just me, my wife and pooch. I have no problem pulling this thing even with 1/2 tank of water, ~80 gal. We live in Missouri (KCMO area). We have been east a couple of times and stayed in the Appalachians. If I'm really anal about figuring the cost of the trip I calculate 7-8 mpg. Depends on head winds, mountains etc. Usually run around 65-70 mph on interstate. I actually got my best mpg in the mountains, 11.
As far as squat when I drop the pin into the box, my truck sets level. IT'S A CHEVY!! The only thing that I have done is add firestone airbags and put Bilstein shocks on it. The airbags just firm it up.
I use to pull a 27' Travel Trailer with the same truck. Even though my 5th wheel is much heavier than the TT, it pulls way better. I even had an Equal-izer hitch which did a great job!!
If I were to change anything or trade trucks I would look at the new Chevy with the 6.6 gasser!! Just don't like the grill, it would be a GMC they are a little better.