What to look out for?

Slammer,
I dont drive a prado, never have but my advice would be for any vehicle purchased used.
Even if not yet required have a major service done...i always do this...it will give you piece of mind that there is nothing wrong, and a firm building block to start you maintainence schedule. Even if some services have been missed previously, from now on you know you have done your best by the vehicle.

when i purchase a used vehicle there are a few thing i do immediately.
1. Major service
2. New tyres (even if not needed...you will now know your tyres history)
3. Full detail (to clean seals etc so they don't wear excessively due to dust etc)

IMHO i believe these 3 things will keep ya truck in good nick....and well maintained, and it'll love ya for it.
Hope this helps ya mate.
Cheers
Wayne-o

If you are mechanically minded put it up on blocks or a hoist and go over every inch yourself and check everything that is possible then service it fully as previously.
If you know little about mechanics then go to a TRUSTED mechanic and get him to thoroughly service and check the vehicle out reporting on anything that needs attention.
The Prado is a pretty capable vehicle that should not give any trouble as long as it's looked after, just keep it away from bowser's as it loves the golden liquid.

Check to se if the Rear LSD still works