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.