After all the conjectures, theories, guesses, here is a printed source of the payload rating for a Trax Gurkha for anyone interested.
http://quhot.com/allgemeines/quiz-08678.html
As I had suggested earlier, its 3750kg.
http://quhot.com/allgemeines/quiz-08678.html
As I had suggested earlier, its 3750kg.