Franglais:
[Get your tape measure out when you next park by an EU trailer. (Or just look closely)
Check the distance from rear trl axle to rear of trailer> it`ll be slightly less than a UK standard trl for a tri unit.
EG more load weight is on the tri-axle group of an EU trl, and less on the pin.
Shirley? Less distance from the last axle to the back of the bed would result in less load to the rear of the axles, consequently more to the front, closer to the pin?