This is really a great article. Clear explanations of how the variables interact. No math.
Cliffnotes. European ideas for acceptable tongue weight are half ours 4-7% vs. 10-15% of trailer weight. So the Europeans shift the gear in/on their trailers a bit rearward so that their trailer tongues aren’t so heavy. Less tongue weight means Euro tow vehicles don’t need to be nearly as stout as ours. The trade-off is sway. The weight rearward in the trailer makes the trailer prone to sway. Since sway is exacerbated by speed, the Europeans tend to tow at slower speeds than we do.
So if you’re willing to keep your speed down, you can safely tow quite a bit. Note, however, that the lawyers might not see it that way. But once the hypothetical crash site is picked clean by gypsies and grifters, there might be so little remaining evidence that you were pulling a trailer that you could contend that [insert really good joke here]
<Maybe it was a mirage, your honor, how should I know?>
<Trailer?. Maybe they glimpsed a tailgator behind me>
And for more comedy: Car Pulling Trailer Smoking - YouTube