I am a GM guy and they changed their HD trucks in 2011 to be able to carry more payload. I believe Ford changed also in 2011 and Chrysler not until later.
The way I see it for payload purposes its like a 2011 GM or Ford one ton SRW is equal to a 2010 or older one ton dually.
So yes the changes made by Ford, Chrysler and GM have made a great difference to the truck campers hauled on SRW drive trucks.
Sorry, I cannot answer your specific question because I don't own a dually, but I have heard nothing but positives about the newer one ton DRW trucks also.
Paul