I picked up the FW today and measured the drop on the rear and it went down 3" not the 1 1/2" I guessed before at what point do you considerer air bags?
The upper StableLoads will help squat the most. The lower ones help sway more. With upper and lower StableLoads, I had no trouble carrying 4000 lbs of camper in the back of a F250.
I tried Timbrens but found Torklift Lower Stableloads to ride better on my 2011 F250. I also added home made Upper Stableloads which helped even more. Squat is about an inch now. I have a relatively heavy pin weight of 2800lbs though.
If you have the camper package with the upper overload springs, you just need the Torklift upper StableLoads to engage that spring sooner. If you do not, I would suggest Timbrens or SuperSprings to get greater spring rate. Bags will help some of that sag, but 3" worth of sag will be hard on the bags and most likely make your truck mushy and porpoising.