Hey guys thought I'd jump in as there were a few questions about the Montero Sport (Mitsubishi Challenger here in Australia).
Mines a 1999 model - rear leaf sprung/front independant/torsion bar. The 2000 onward models were rear coil sprung which is what I'd go for if I was going to do it again mainly to be able to use airbags more easily in the bag for loads.
The run a ladder framed chassis and everything is nice and tucked up underneath (nothing really protrudes underneath the chassis) and has good steel guards / skid plates on those things that need to be protected.
I'm currently running about 3" of suspension lift and 2 inch of body lift. This allows me to run the 33x12.5s MTRs with very minimal scrubbing up front (with some modification of the bump stops and a bit of plastic trimming/beating the inner guards).
I have the 3lt V6 Petrol in mine but I believe you guys get a 3.5lt version over there too? Fully loaded for remote trips I can get just over 500km out of a 70lt tank of fuel - not to bad for the level of modification of the vehicle!
I've got mine fitted out with a custom rear storage system with a slide for the Engel, electronics etc. Have a custom made canvas awning mounted to a Rhino Rack roof rack. Pretty much all of the modifications I have done myself to turn it into a comfortable expedition vehicle. Each trip sees me tweak something small to make it that little bit better.
Next on the list is a rear ARB locker and some custom sliders. I'm umming and ahhing about a front ARB bar - they look cool but weigh a hell of a lot and I'm not all that sure I need it (haven't thus far!).
In my opinion for 2 people it's a fantastic size and a very under-rated vehicle. Mine has been driven hard and has done a lot of offroad KMs with no problems ever. Just lately I've developed a bit of an oil leak in the rear main that I'm going to get looked at but apart from that she just keeps on going.
If you guys have any specific questions let me know!