Traded my 2013 F250 in on a 2016 F350 DRW. Wow what a world of difference from towing with a SRW to a DRW. Should've got the dually in the first place. I would post a pic but I don't know how.
Haven't got to use the engine break yet as I've only towed on flat highways so far. But there is a noticable difference in torque/power. The 2014 and later models come with 440hp and 860lbs ft torque.