very nice question ....
of course this trigger the question what is an expedition ?
which is the real question .
so what vehicle i need for my expedition ?
What NOT is an expedition :
is to go camping and in service areas , or camp near a 1-2 days walking distance ( 50 km ) to service facilities .
this is a normal camping or 1-2 days hike .
to make an expedition for me is to explore a remote area where there is no food , or water or any facility in a wide radius , lets say over 200-300 km ?
the exploration will need some time , as a consequence I will need a base camp or a moving base camp.
this is the reason to have an expedition vehicle.
of course the settings of the truck may vary quite a lot , in accordance to the range , weather , n.of people , interests ,ecc .
in general my first priority is safety and reliability of the vehicle , range , water , and last but not least camping confort .
vehicle must be as less flashy as possible , no extra big wheels , huge bull bar , canisters hanging on here and there .
big lights , roof rack loaded with all but necessary .
the truck must be able to do the route , nothing extra must be on it , just the essentials .
( this could open the door to a HUGE discussion on "essential" )
in other words travel light and as local do .
my very personal opinion
Renago