Fortunner 4x2 & 4x4, Hilux 4x4 / 4x2 double cab pickup truck & Prado 5 door are on common chassis - check for physical dimensions in spec sheets. Fortuner is extension of 4x4 double cab with the rear bed infused to a CABIN. It was evolved for Asean market sometime in 2004 / 2004.
Prado is better choice with atleast 6 variants of 3 doors & 5 doors landing into Pakistan from Japan & Thailand as 3 year old used vehicles.