I haul an AF 865 on a 2011 F-250 with airbags. It has camper pkg and heavy duty options and is identical to an F-350 suspension wise. My truck has airbags and Rancho 9000xl's and is a far stouter truck than an older F-250 and I still think about a dually as an option if we replace this truck.
I asked a couple of different AF owners with SRW and DRW trucks, everyone who went with DRW was glad they did and said it eliminated issues with rocking and concerns about a blowout.
You should be able to get a nice 2-4 yr old dually for far less than a new SRW truck and have nicer options.