Tongue weight in Europe is around 7%

There are differences in how trailers are loaded. In North America it is very common, for example, to hang a spare tire and possibly a few lawn chairs and an extra ladder all off the rear of the trailer. Then, to compensate and get the desired tongue weight, the trailer is loaded heavily in front. In Europe according to what I've read, it is quite uncommon to add weight to both the rear bumper and the front of the trailer. Spare tires are commonly carried directly underneath the trailer not too far from the axle to centralize the load. American trailers are loaded as if they are dumbbells, or barbells. European trailers are loaded with the heaviest objects toward the center, albeit still ahead of the axle. I think this is more like the average boat on a trailer.