This is the worst review that I have seen so far on the Titan diesel. I hope that it is an isolated case: http://www.caranddriver.com/reviews/2016-nissan-titan-xd-long-term-test-review
When I saw the XD initially, the payload was much less. I think that it was around 1400? but it could have been 1700. Again its been about a year ago, I just recall seeing the payload and thinking that a normal 1/2 ton offered more. I still have not seen any literature from Nissan stating that its a 3/4 ton or marketed as such. Guys Im sure it could be out there, I just have not seen it, despite the numbers your posting above.