Sway Control - Will this help?

I don't have a problem with my trailer swaying, as in being improperly balanced, etc. It tracks nicely behind our van at all speeds.
But when a truck, or even a car, passes us on a 4-lane hwy, the van gets "pushed aside" very slightly. Just enough that I have to turn the steering wheel left then right to keep in the lane. The push from the passing vehicle is v e r y slight, but it does require action on my part.
My wife drove the rig once and did not like the feeling, especially when large semis went by.
Is this something a sway control, like this https://www.etrailer.com/Weight-Distribution/Curt/17200.html would cure or eliminate? It's only 40 bucks US, considerably more in Cdn $
but I wonder if anyone here has experience with this.
Any advice is appreciated!
Thanks in advance.
But when a truck, or even a car, passes us on a 4-lane hwy, the van gets "pushed aside" very slightly. Just enough that I have to turn the steering wheel left then right to keep in the lane. The push from the passing vehicle is v e r y slight, but it does require action on my part.
My wife drove the rig once and did not like the feeling, especially when large semis went by.
Is this something a sway control, like this https://www.etrailer.com/Weight-Distribution/Curt/17200.html would cure or eliminate? It's only 40 bucks US, considerably more in Cdn $

Any advice is appreciated!
Thanks in advance.