Charlie, try going across SD, WY or MT with crosswinds gusting to 50MPH and tell me how you feel about sway control.
There are plenty of other times when I an glad I had my Hensley, like the time an idiot in the oncoming lane pulled out to pass someone, had it not been for the Hensley I would not have been able to avoid the a$$ and bring my rig back on to the asphalt.
I to have been towing for 35+ years and know all about pulling the TT, but there are times when it wants to push you and when you have to make an emergency maneuver, it wants to push you.
The difference between the semi passing you is you feel it, when it passes me I don't feel a thing and that's the way I like it.