It is my feeling right now (might change in the next week or two) that your truck if far better suited for an "adventure camper" than the FMTV due to your truck having higher highway speeds, and open frame space up to the back of the cab, more open space for saddle attachments.
John, what is the top speed of your truck?
I honestly doubt that very many "sane" people would take an expensive camper into places that needed the all-terrain capability of a FMTV... but then again, there are plenty of people out there with more dollars the sense.
Joaguin
Top speed I have driven steadily is about 77-78 mph [pushed by traffic one evening while trying to transit Salt Lake City UT on the Interstate.] Seemed comfortable/safe, but going that fast in this big a rig is not my cup of tea, even with 38,000# of Bosch air-over-hydraulic disc brakes onboard. I commonly cruise at 60-65 [@2200 rpm], tho on moderate hills I suffer a significant loss of speed due to an underperforming turbo.
Factory spec boost should be 36 psi absolute, but I cannot seem to achieve more than 32, even with a new turbo 'courtesy' of Mitsubishi. 4 psi would make a BIG difference in a days drive - not so much in elapsed time but in subjective driver stress when things slow down and traffic piles up behind. I've tried a 'tuning module' that optimized common rail pressure, but at the point of significant improvement I also got a string of overboost and high pressure fault codes, resulting in entering limp mode. This was for me more stressful and disruptive than just going slower.
Our Fuso has been converted to 4x4, and in 4x2 low range we have cruised power lines [no roads] and several alluvial fans and dry stream beds. Have only used the locking rear diff once, and even that may not have been truly necessary — but I confess that the prospect of 'recovering' a 22,000# rig out of a truly inaccessible place does not thrill me, so I choose to use its capabilities prophylacticaly!!
I'll leave it to you to determine if that is "sane" or not.
John