How long is a piece of string, only you can decide whats good for you. In addition to the typical servicability and capability you need to consider:
Will you sleep inside or along side your vehicle?
What type of terrain in the best case? Tight jungle trails or open desert?
Are you willing to setup a tent everyday?
How much fuel do you need?
Are you supporting other vehicles?
How many supplies do you need?
How many people, kids, dogs?
What type of protection/security do you need? (from people, animals, the elements etc).
Unleaded and ULSD may not be avalable so what type of fuel will you have access to? Will your engine burn it and still be reliable?
I think a lot of people get offroading and expedition travel mixed up. Typical expedition travel is dirt roads and hundreds of miles of washboard like roads. Not much in the way of capability but every now and then that capability is needed such as when getting out of a dry river bed - these 1% situations are where the mog excels. Expedition travel is more about durability that outright capability. Unibody vs cab over is a question that needs to be asked, I have pictures of a new dodge that drove across africa and at the end of the trip the doors would not close because it had been twisted so badly.
You are not taking a camper like these over the rocks or risky terrain when you are hundreds of miles from help, if you did or were forced to you'd be suprised at how well they perform and how stable they are.
Rob