I am of the school that says all trailers should have some sort of anti sway control. Since I have always towed with a half ton the WD is a no brainer for me. Since I had to get a WD hitch I chose to get one with built in sway control. I just didn't want to mess with those add on friction bars. I have a brother that uses one and has told me that he connects it when he thinks he will need it. What? Who can forecast the need? Some folks use two of these bars, some use one, some tighten them up real tight while others "just a little". Then some also require you to remove them before you back up.
Get a WD hitch with built in sway control and you will be good to go. There are some good options out there. I like my Equalizer. I used it on both of my trailers. I towed a smaller and lighter hybrid and had to deal with big winds and passing semis. Glad I had it. My current trailer tows much easier. I am not even sure that I "need" it now but I won't give it up.