Does the trailer load change when the load is increased?

The total towing weight of the vehicle remains unaffected if the load is increased.

This may result in the trailer load being reduced due to the additional load.

Example:
Total train weight: 5500kg
Before loading: 3500kg + 2000kg = 5500kg
Towing vehicle: 3500kg
Trailer load: 2000kg:

Total train weight: 5500kg
After loading: 4090kg + 1410kg = 5500kg
Towing vehicle: 4090kg
Towing capacity: 1410kg

The D value of the trailer coupling must also be taken into account:see D value