Re: Towing a Car
You won't have any problems as far as power and weight is concerned.
You may have trouble in as much as rear end sag on your ute. Mainly because to create a nice stable load, you need to have a a fair bit of 'ball' weight, that is, the amount of weight on the tow ball. If your total towed wieght is (say) 2000kg, then you should have at least 150kg - 200kg ball weight. Now because this weight is right at the back of the ute, getting heaps of leverage, it will load you down quite a bit.
It should still handle it ok, it's just that your steering will be a little light and handling will feel odd. If you see that it does sag quite a bit, just keep the speed below 100 and it shouldn't sway.
I would also increase the tyre pressures to at least 40psi.
Yes, towing in 3 rather than D would be a good idea, and manual changing down going down hills won't hurt either.
You should also make sure 100% that you have the big square tube 2300kg tow pack fitted as the normal one is only rated for 1600kg.
The car mechanicals will be fine.
I've towed many full sized sedans on car trailers with my I6 XH ute without hiccup.