Hello Icemaker,
Thankyou for your posting, and provided the documentation you have was supplied originally with your vehicle then that is fine, BUT, in Kenneth's case the original documentation seems to say 50kG, and that is therfore the legal limit for his motor.
The reason is that the manufacture will have a record of the chassis number, and be able to confirm with the authorities the date when the motor was despatched from the factory. They will be able to recall any modifications and revisions to the design of the vehicle at that time, and they may affect the vehicles permited nose load.
In addition, the documentation will also be date coded, and the manufacture wil be able to confirm which revision of the paperwork was supplied with the motor, thus for a given range of chassis numbers, thier legal nose load limit may be different to your own.
Kenneth still needs to seek written confirmation of an increased limit for his vehicle, befoe assumming or using 85kG as his limit.