When travelling offroad, it's often necessary to adjust tyre pressures to suit the terrain and to do this, you need to be able to air down and air up whenever it's required.
Typically a range of vehicle-mounted 12-volt air compressors allowed you to do this as well as run your air lockers. With the advent of electronic diff locks (often fitted as standard from the factory, there is no need to run air lockers anymore, so a portable air compressor can make more sense.
Another alternative is to install an air tank somewhere on your vehicle so that you have sufficient air on hand to reseat a tyre on the bead if you do happen to roll one off the rim.
This requires a different style of air compressor that can handle a much higher duty cycle rated for higher pressure. As with anything, avoid a cheap Chinese air compressor as they have been proven time and again that they have a short life and typically fail when you need them most. A good quality air compressor typically gives 5-10 years of life or more.
Having a compressor with you on a trip ensures your tyres are always in great condition to have a smooth drive and be ready against anything Australia’s harsh off-road conditions throw to you.