I have a different experience, and I'll say I'm generally pretty critical of performance. For context, as someone that's spent time with vehicles on the track, I have high expectations for performance and overall handling, towing or not, and I'm pretty dialed into vehicle behavior whether suspension geometry, suspension, tire pressure, etc. Having been on this board for awhile, I think most know how much I pour into detail when modding to get things just right.
My setup is stable that I'd be confident to let my wife drive, even 75+ mph. Whether she feels the same of her own abilities is a different story, but it is that stable. I do cruise on occasion at 80mph in states like AZ where even the big rigs are flying. I travel through mountains regularly being in SoCal to escape the heat, but the rig is seriously stable enough that I might even touch on freeway speeds in the mountains downhill. Sure you can read that as overconfidence, and I consider myself a conscientious and a safe driver, but the rig is seriously that stable. Passing on the freeway, touching over 85mph maybe a bit aggressive, but I've done that too. It's stable, and at no point is does the family sense anything but, and goes about doing their thing. Speed is the biggest variable to sway, and I've never experienced any onset or escalation of it. But then again, other than sometimes speeding (mostly 60-70 to conserve gas), I don't put myself in situations where I know it can be exacerbated, particularly when the trailer has excess momentum trying to overtake the TV, like in downhill slowing or braking situations. Setup is important, as it's critical to get the brake gain right so the trailer generally has the hitch lash up in tension...but I'm getting ahead of myself here.
Excellent stability is possible and important because if it sways at 65mph, it means there no reserve to handle other environmental situations that can exacerbate it more, to the degree that it truly becomes out of control. Also stable performance means less fatigue over long driving days. Happy to help you get there because I personally don't feel like there is a better vehicle that blends adventure, comfort, and capability.
Take a picture of the hitch from the side, and we can start there if you're interested.