I dunno, it seems here in Oz a lot of them have a tendancy to break down quite a bit. The last outing I got taken on, two of the rovers ended up with broken rear diffs (apparently a weakness in the design). One of the first mods off-roaders do to their rovers is upgrade the axles and diffs. Another one got a punctured gas tank, which isn't necessarily a defect, but still makes you wonder why not a skid plate if they are gonna put the tank in that precarious a location.

Seemed like the rovers were suffering more calamities than the landcruisers and jeeps were over the same course. They also seemed to get stuck a lot more often in the mudholes.

Just an observation. Any vehicle can get broken quick enough if you push it beyond it's limits.