Tail wagging the dog.....it does help to have four wheels back there not just two. That extra rubber and weight does help.
I have a Grand Junction 35TMS, almost 40ft and 15,500lbs. I was over the 2010 F250 weights all the way around except the FAWR. Course both dealers said no problem. And it did handle it pretty well with the airbags. It was four door and long bed, so was a beast of a truck. But I still was going to add more weight in the truck and front of the trailer, ie Gen. and W/D, and just didn't want to push it too far. So went with a 2011 dually, same set up otherwise. Even my wife could tell the diffence sitting on the other side. Power and fuel economy was a bit better with the new truck, but that was because of the engine, nothing else. Basically it just makes it so that I am under all my ratings instead of over them, and it stops a bit better and can carry the load better.
Now, if the numbers showed a SRW truck would work, I would have done that, but since I Knew my numbers a head of time and understood them better, I knew I needed a dually for both GCVWR and RAWR.
SO yes, the 25O would pull if fine, and hadled pretty good, thought everything was fine till I got it weighed ready to camp. You really cant appreciate the difference till you two with a similar dually, not one 10 years older.
For me, a dually is no big deal, even as a daily driver, since I spent 25 years driving a straight frame ladder truck for the fire dept. Seems like a sports car!
Kind of like using a little hammer to drive a nail. If you are using a finish nail, no problem. And a framing hammer may be a bit overkill. But if you are driving a galvanized 20d nail, the little light hammer will do it but will take forever. RIght tool for the job.