2016 Tundra Double Cab SR5

I have been towing for 2 years a 30ft Cougar 5th wheel weighing (have weighted it) 9600 lbs with a 2011 Tundra reg cab long box 5.7. No problem with power towing and fuel mileage not bad it I stay around 60 mph. Very stable tow vehicle with 5th. Good you have the dual cam hitch it really helps as I used to have a 4runner and trailer and the dual cam made it much better than reg non sway hitch. I get as high as 11 mpg under ideal conditions and seldom dip much lower as I adjust my speed to wind and hills etc. Do not feel I am straining truck at all but in my case I am over payload when fully loaded if I have water in my holding tanks and much in basement. Had a heavier 5th wheel before and it handled it fine, I just don't like being overweight. We tow from Alberta, Canada to Arizona every year (where I am now) and all over BC rocky mountains in summer. You will be fine as long as not over payload, that is the problem, not power.