I'm in a similar situation to 2Dogs.
We've had more Territories than I can remember, with the 2 most recent being diesels. We've also had Ford heavy duty towbars on all but one, which was a Hayman Reese. Apparently it got fitted 'outside' as the pre delivery guys were too busy.
The only one I've had trouble with was the Hayman Reese. I bent it! At the time I had a single axle Windsor Rapid (before I saw the light and bought a 17.56-2 OB). Further investigation revealed that the 2300 kg HR bar has the same mounting points as the stand duty factory 1600 kg bar. No wonder it bent! The factory 2300 (2700 AWD Diesel), has many more mounting points than the HR, and I'd never recommend the HR on a Territory after seeing the difference. Not to say that the factory one is the only way to go, I just recommend doing your research and check out how the different brands are mounted.
I've seen the Ebay BTA? brand and they have similar mounting to the factory 2300. (not that that's a recommendation) .
Andrew
PS. You don't need to have the Factory, non ajustable hitch with the factory bar. The HR WDH fits, you just have to take the sharp square edges off the section that runs into the receiver, as the Factory receiver has more rounded edges.