If the trailer does not sway, then it does not sway.
If you will be using a WD hitch then that will stiffen up the coupling and lessen chances of sway a little, but having a fat rear end like a dually will help to fight back a trailer that wants to sway also. I have towed swaying trailer with a dually and laughed at the trailer.
Load the trailer correctly so you do not introduce sway.
1,000s of RVers tow millions of miles with no sway control and never have sway issues.
Use sway control as a fix if needed, when needed or if ever needed...