Is a manual or auto ute better for touring with a caravan?

The manual will give you about 10 per cent better fuel consumption than the auto. I would expect you would get about 9 litres/100km on the highway without a caravan, but that would probably increase to 14-15 litres/100km when the caravan is on the back. The Hilux and Navara have similar fuel consumption. But I have concerns about the reliability of Nissan's 3.0-litre turbo-diesel engine so can't recommend the Navara.