I think you're getting tied up with the weights Mr K.
The empty weight for the whole rig is he told me 2700 kgs, which puts him in tacho territory
(more than 2.5 tonnes). 6500 kgs is the permissable GTW not what it actually weighs in at.
Its a lightweight trailer built for volume more that weight carrying.
Done (Thanx) ME, forgot I had put my location in.
Have fun
Terry