I'm a fairly new TM owner, having purchased it in November from a ember forum. Conventional wisdom is that the TM doesn't sway, due to its profile, and for a couple thousand miles I believed that to be an absolute. Pulling the TM with my expedition and a WDH the rig was rock solid. However a recent emergency maneuver cause by another poor driver convinced me that this wasn't an absolute truth.
I was coming south on I90 when another vehicle swerved across the highway to get to the exit. I gues he missed it, and figured moving across two lanes was the way to get there. He misjudged, and put his brakes on in front of me, forcing me to slow then change lanes...NOW. I awoided the accident, but I learned something.
Perhaps I performed the maneuver wrong, or perhaps there is a limit to the Vaunted TM stability, or perhaps I needed more toungue weight( though the trailer was nearly empty). In any case, what I saw in my rear view mirror and felt in the steering as the trailer swayed left my heart pounding, and I decided I needed something more.
Now, Tge WDH and swing hitch don't leave me room for a sway bar. Spotted the Tuson electronic Sway control on Amazon for $292 and snatched it up. A review about this gem can be found here:
Took it out for a test drive and tried a couple lane changes, and felt the brake controller doing its job. The trailer never swayed before in these conditions, but the back end seemed to overshoot a little. That overshoot was gone.
Whether it truly makes a difference or not will need a longer road test, and an emergency maneuver I hope I never have to make again.