Image for easy seeing/thinking.....

They gave me these values :-
Manufacturer: BOSAL
Code: 017-072
Product: Trailer Hitch
D-Value [kN]: 14,5
Drawbar Load [kg]: 120
Inspection Tag: EC0016
Towed Weight [kg]: 3000
Trailer Hitch: with rigid ball head
Any one know what the D-Value is??
I know the drawbar load is the downward load/ hitch load.
They couldnt say if i could put a 6000kgs breakpoint shackle at the bottom for a rescue rope, more secure then throwing it over the head.
Thoughts??