My F350 dually came with both front and rear sway bars (camper package). I replaced them with Hellwig front and rear bars which are MUCH bigger (front one went from 7/8" to 1.5" - 8 times stiffer). It makes a big difference in body lean, and also any bump or roll steer associated with the suspension. That helps on corners, but also anytime the suspension is disturbed, say by a crosswind or a big truck passing. I also took the rear off for awhile after I swapped the rear suspension for air suspension. The air suspension allows less roll and roll steer than the springs did, but it still was lacking so I put it back on. The only downside to really stiff anti-roll bars is if you off road a lot on really rough stuff. Then you can always disconnect one side. They make a very slight degradation in empty ride quality, but you have to pay attention to notice.