Yep, the WK2 seems to be pretty solid, no real pattern failures like the Prado D4D had.
There have been a 'few' issues that have appeared in the forums:
1. There have been a few 5 speed transmission failures when used for towing. Maybe buy one without a tow hitch so you know it hasn't been loaded up. Having said that there are also plenty of 5 speed owners who have towed big vans with no issue.
2. Aircon condenser failures, had a few reported in the forums, some have gone for aftermarket replacements and saved a bit.
http://www.ausjeepoffroad.com/forum/...d.php?t=140767
3. Oil leak in the timing chain cover gasket leak:
http://www.jeepgarage.org/f222/possi...ine-87047.html
And you can look through the TSBs:
http://www.wk2jeeps.com/wk2_tsb.htm
Quadra-lift will normally throw an error if there is a problem, it should display on the dash, service air suspension message or something like that. Just check that it will go into all 4 height settings without error. The only issues I've heard of is air line leaks, which can be a bit tricky to find, but they don't appear to be common.