For a few years from 2005, Nissan sold two types of Navaras in Australia - the all-new big D40 series and the old D22 that dated back from the latter 1990s.
If you want an inexpensive, compact and hard-wearing truck that's reliable but not very refined nor comfortable, the old D22 is it. Its 3.0L turbo-diesel has proven strong and reliable in this application and the Nissan has a reputation for being as tough as nails.
The larger and newer D40, meanwhile, is the much better choice if space, safety and refinement are priorities, and remained a class-leading proposition right up until the current-generation Ford Ranger, Mazda BT-50 and Volkswagen Amarok all moved the pick-up truck game on in 2011. The Spanish-built ST-X is the choice grade, especially in turbo-diesel and 4x4 guise.
The Navara is considered a reliable and dependable truck, but many are also workhorses that lead tough lives and are often neglected or mistreated. If you're after one, please consider having it checked out first by an experienced mechanic.
Known issues include fuel-injection failure, roof rust, premature clutch wear in manual models, electronics issues, turbo-charger failures and sagging rear springs.
Such problems can apply to any similar truck, so don't be too put off by the D40 Navara. It's a firm used-truck favourite for good reason.