I have a 2011 F-350 dually and I do believe they squat too much when towing or hauling a good load. They sit lower than GM duallys to begin with, but load them up and you can see the ford sits lower in the rear. I def want to get airbags. I think the Ford duallys are lower then the SRWs empty to begin with, perhaps for a towing bias?
I'll snap a pick of my 11 parked next to a 09 chevy dually tomorrow for comparison. As far as ride quality goes, the 11 fords are excellent and IMO are almost equal to the GMs. Dodge is not even in the same ballpack and rides much rougher.