There are two things I have seen cause a trailer to sway. One is if it is tall and long and there is gusty wind. That use to be a problem with my Dad's old 32' Spartan trailer. The TM should not have that problem.
The second is loading the trailer wrong. I had a Coleman tent trailer that weight less than 800 pounds empty. One time towing it, it was all over the road. It normally did not do that. I knew what the problem was. My sons had loaded the trailer for me while I was at work. I pulled over, opened it up and moved more weight to the front of the trailer. After I did that, no more sway. Again with as far back as they put the axle on the TM, I would hope that would not be a problem unless you put everything heavy at the back.
Still a sway bar is not a bad thing to have if you have to jerk the wheel to avoid an accident.
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