Would say that a good weight distribution AND sway control bar will all but eliminate this.
So many brands it's hard to recommend one name. Start educating yourself by looking at E Trailer and Curt. Watch some manufacturers videos so you get familiar with the nomenclature of the various components. You Tube also had lots of good videos.
Then figure out where you will have it installed and what brands do they sell and recommend.
Vintage trailers are light weight and may react slightly different than newer trailers with greater weight. They also glide better (opinion) than other trailers because of their very aerodynamic structure.
Our trailers seem to have a sweet spot at 68mph and that's where we tow if weather, inclines, traffic and speed limits allow.
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Hittenstiehl
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