I would tackle this question from another angle, then the vehicle choice might become an easy one:
While touring, where do you want to sleep & cook.
1. in a Hotel/Motel & Restaurant
2. in a Caravan/Camper Trailer
3. in a Tent/Roof Top Tent
4. in the vehicle.
Vehicle for Option 1: probably any vehicle of the major companies would do as long as it is very comfortable, dust and waterproof, a good air-con and stereo equipment.
Vehicle for Option 2: vehicle with good towing qualities and excellent fuel economy - which would leave the bigger engines out.
Vehicle for Option 3: vehicle with loading space for the tent and kitchen equipment. In case of a roof top tent you need excellent fuel economy as the additional 40 cm on the roof (excluding roof rack) will make you use more fuel - again would settle for a smaller engine.
Vehicle for Option 4: Now we get down to only a few. Troopie, Defender 110/130 (or the bigger ones like Orka, Unimog, etc.).
For us it is definitely option 4 and I would still go with a Defender and Pop Top setup.
Having travelled extensively in a 110 through all sort of remote areas and terrain and now in a 130 throughout Australia. Just lovin' it. The Td5 engine was/is in both vehicles very reliable.
In regards to vehicle reliability and mechanics along the way.... on our latest trip through Australia we passed three Troopies with broken gearboxes, they all had to way for a mechanic ... . So agree with the comments made earlier on, whatever major happens to your vehicle, most probably you could still need wait for the parts to come to you.
Cannot wait 'till Easter, to get out there again.

