I'm the nobody with a 4x2 :).
Ford may have upgraded the specifications but the limit for towing without weight distribution on my F250 (2012) is 6,000 lbs.
As far as towing an 8,800 lbs trailer with an F250, I think you've got plenty of power/torque to handle that job even with the gas 6.2L. On flat ground I'm running highway speeds at ~1,600 rpm and on the steepest grades I've encountered in Pennsylvania ~3,000 rpm. The maximum trailer weight specification is 12,500 and payload is 4,000 lbs (I have a gas 6.2L, regular cab, 4x2) so the 8,800 lbs isn't coming close to maxing out an F250.