Most of the better WD hitches, Equal-i-zer, Reese, etc., have sway control as part of the weight distribution mechanicals and you'll probably find that no additional sway control is necessary. My Equal-i-zer's sway control is all that is required for my rig.
My 2 cents, your mileage may vary...
2 Cats; J-Lo and Ragamuffin :R
2014 Thor Tuscany 40RX DP
2011 Ram 2500 Longhorn CTD HO
2011 Keystone Cougar 318SAB (now gone)
2008 FunFinder X 210WBS (Sadly gone)