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Zybane,
Look up a company called Hallmark. They build-up Custom Trucks, to with there Campers and Flat-bed Cabins. The quality seemed very high, I'll load a photo for OL Expo, when we get home. Also a different option, and story to share with you from Lance at EarthCruiser... More soon. DCG
The problem is the price/capability/living-space triangle is pretty much impossible to settle unless you have ungodly amounts of money. You pull on one point of the triangle and the other two items go completely out of whack.
I'd go F450 CCLB, 4x4. Add a Detroit locker to the front axle. And wait to see if anything is ever available for the rear axle. Although, one locker might be enough.
Add any slide in camper with a slide out. Done. That's plenty for just about everywhere in the US I've been to. I think you'll be impressed by where such a setup can go. Obviously such a large rig isn't going to be a Jeep. Building a large rig, to have Jeep-like capability, that'll never be needed or used, is a waste of money. An F450 does pretty well, anywhere it can fit.
I'd love a giant earth roamer. But there is absolutely nowhere to drive one to it's capabilities, anywhere I've ever been. Waste of money to build an expensive off road truck, that doesn't FIT off road.
You could also go F550 instead. Get a flatbed camper or a permanently mounted camper. And then you have more room to do a "brush truck" setup with wheels and tires.
Maybe get a little trailer for a motorcycle so I can still play with the little Expo guys.
Or go waay under budget. A simple F350 DRW. Front Detroit locker. Little MT tires. And a Camplite slide in camper. Smaller and lighter, goes along ways:
Does money even solve it? There are lots of places those fancy Earthroamers or Mogs won't go. There are tradeoffs for size and weight (living space, appliances, etc) vs the ability to "go anywhere". Even if the rig is very capable you'll have issues in trees if it's too big and tall. I decided to go the kinda cheap, reliable, big (stand up), light weight, route. For our needs this is the best option. But if primary use was shorter trips, I'd have a smaller truck with more serious offroading upgrades, and a smaller camper. At least we have plenty of choices.