OK, here is my take on this subject, I think the overland title for vehicles that are built to traverse, long, distance, self sustained trips, no matter where it might be. BUT I think a point that may have been missed is this, I feel that an overland is a vehicle that has been built with the idea in mind that it will carry enough food, water and gear to remain self sufficant for as long as possible, AND a vehicle that is minimal in in major accessories and changes, so if needed you can get parts easily, for example, overland or " tourers" as they are called over here in Australia, are usually Nissan Patrols or Toyota Landcruisers, and one of the reasons for this is there is heaps of them. If needed nearly every farm or station ( ranch) has one that you may be able to get parts off.
Where I'm assuming it would be really hard to find parts for a D60 or a coil over. NOW I have been lucky enough to take a ride in Moby, be it on the road and the ride is awesome to say the least, and to take Moby for a 2000km run on high speed corrugated roads in outback Australia would be a dream, because other than some remote places in Australia, where a long range fuel tank, and the ability to cover 1000km without seeing another person or petrol station, there is no reason a vehicle like Moby could not do it. Not to mention it would look really good doing it.