Again, you have no roads that go above the 9,000 plus feet above sea level that the OP went on let along above 6,040 ft. No little Australian truck is licenced to tow the 4,500 kg the OP towed along with the additional 635 kg he had in the bed. Nor do they weigh 3,600 kg. Also, most laws in Australia regulate tow vehicles to well under the speed the op was towing.
Again you avoid answering the question. Did the OP do 9000miles Answer No.:(
Go to New Zealand and you can tow 7,000 ft. Thousands of people of people do the Big Lap each year:B