Yes, it is. Do you realize that manufacturers publish a maximum towing capacity as part of their specifications for every vehicle?
And have you compared EU spec manuals vs. American model versions? When it comes to specs there's another big difference which I didn't mention: Tongue weight. Which isn't towing capacity and EU spec trailers have drastically lower tongue weight for their rated carrying capacity: Because we actually pull loads with light vehicles. As already said, put four wheels on a trailer and the tongue weight is practically zero. Our trailers also come with brakes.