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Theoretical horizontal force between towing vehicle and trailer. The D-value can only be calculated with the permissible total weight of both truck and trailer.
T = total weight of the towing vehicle in t
R = total weight of the drawbar trailer in t
g = gravitation acceleration 9,81 m/s2
**The total weight of the towing vehicle (T) and of the drawbar trailer (R) refer to the vehicle registration.
**The calculated D-value can be equal to or lower than the D-value of the hitch and of the towing eye.