It appears that some of you don't follow the overland world. You may find this an interesting read: http://www.xor.org.uk/silkroute/equipment/choosevan.htm
While many overland campers have 4x4, overlanding is emphatically not jeeping or trail running, it is all about a vehicle strong enough and comfortable enough to survive two or three years in less developed nations. Do you need a full on, Unimog based vehicle? No, these folks have done very well in a Tiger: http://www.travelin-tortuga.com/Travelin-Tortuga/Home_Page.html
Might you want one? Consider: http://www.whiteacorn.com