If this is the post that concerns you:
https://www.trailmanorowners.com/for...manor+accident
there is a lot of good information here.
The other TM accident I came across was this one:
https://www.trailmanorowners.com/for...manor+accident
In both cases, there were mistakes made by the driver. (I'm not trying to be critical about the drivers here... when things happen, we act by instinct and sometimes instinct is the wrong reaction). In the first case, post #8 has a lot of good information, and suggested it wasn't the vehicle trailer combination, but perhaps how the trailer was loaded, or perhaps a tire problem. In the second case, the driver encountered poor road base (grass, gravel, concrete).
When we travelled to CA last year, I noticed a lot of people pulling trailers would travel over 60 mph. Exceeding 60 mph is not a good idea. If you keep your speed at or below 60 mph, it gives you some room to accelerate slightly if you begin to get some sway for any reason. A slight acceleration will recover from sway, but drivers may panic when they experience some sway, try to brake, or correct with the steering wheel. These will make the sway worse.
I think you should be fine as long as you account for road conditions, and keep the speed down. We pulled our TM from Tacoma to Canada 2 years ago. I didn't have a WDH yet, the height of the hitch ball wasn't right, and the rear shocks on my Tahoe were shot. I also later discovered that the trailer brakes were not working. Not a good combination. We pulled the trailer home at night when there was less traffic, and I kept the speed down. I never encountered any sway at all.