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The kit that came with the car is built for a world where the ambulance is ten minutes away. Here's what a real 4WD first aid kit needs for remote travel: the base checklist, the snake bite gear most kits skimp on, the remote-area extras, and where to keep it so you can actually find it.

A factory TPMS only watches the four tyres on your 4WD. If you tow or drive remote tracks, an aftermarket system is the one accessory that tells you about a failing tyre before it takes the wheel arch with it. Here's how they work, internal versus external sensors, and what to look for when you buy.

If your 4WD is newer than about 2012 or you run a lithium battery, a plain isolator will never fully charge your second battery. Here's what a DC to DC charger does, how to size it, where it goes and the wiring mistakes that cost people their charge rate.