I had a 2007 GLX-R 3.2 Diesel Dual-cab 4x4 from new up until last year. Only sold it because we wanted a higher towing capacity. Had over 250 000 Ks on the clock when sold and still tight as a drum. Solid chassis and drive train and not prone to rust.
Things to be aware of are-
EGR- your inlet manifold and EGR valve are prone to getting clogged up with oil and soot. There's a electrical solution for this, but it is only for "OFF ROAD USE"

Timing belts on the 2.5l diesel need regular replacing.
Lots of info on the web about these vehicles like on newtriton.com. Parts can be sourced at reasonable prices and with OBDII wifi dongle and an iPhone app you can get access to the computer to diagnose problems and reset codes.
With a lift, bigger tyres and ECU custom tune these utes make pretty good off-road rigs.