The Prado is a diesel and you wouldn't know the van was behind you. Towed it from Bathurst to Mudgee via Sofala so the country was pretty hilly.
I've also got a current model petral hilux (4x4). Tows it great on the flats although you feel the hills. Also the fuel consuption goes up a fair way. You also need to watch your load with the Hilux (2250kg).