If it were me, I'd add bags. It helps with sway and squat tremendously. I would think the truck would still squat a lot, regardless of suspension. The auxiliary springs help but are not enough. (Not all Super Duty's have aux springs btw...it's an option). A little extra assurance can't hurt. They're easy to install and work great. The hardest part is getting the old bumpers off. That nut always seems to be a bear to wrench off.
2013 Jayco Eagle 328 RLTS
2012 Ford F250 6.2L 4x4 CCSB W/Air Lift air bags
2002 Coleman Bayside Elite (traded)
Me, Momma and Charles (RIP buddy)
And introducing Sofie!! ;)