If everything is working properly, it’s less likely to be a stuck or fused relay as that would affect the operation of that circuit. In any case most relay-controlled circuits would probably be disconnected from the power source (the battery) when the car was not being used. Which, of course, brings the ignition switch into play as a suspect, on the basis that it might not be powering the car down fully when switched off.

Typically, problems like this are caused by boot lights or courtesy lights somewhere on the car staying on. In the Territory, these functions are controlled locally by micro-switches (on doors and tailgates etc) and in an overall sense by the body computer. Body computers on this generation of Ford have been known to fail, often with consequences for all sorts of functions including the central locking and possibly the courtesy lighting. Check the car on a dark night to see if there are any lights stuck on.

A security system/alarm is another great source of battery drain. Does the car have an aftermarket alarm? Even if it has just the factory security system, that would be worth checking as a cause for the battery drain. Is the car’s stereo powering down fully when you switch the ignition off? This can also be a cause of flat batteries. Again, the body computer might be the culprit.

A car with a little extra ground clearance is great for camping as it often allows you to get a little farther away from the masses in their caravans who tend to huddle around the shower block at bush campsites.

The Subaru Outback is a good, solid choice and if you can find an independent workshop to service it, you’ll avoid the cost of dealership prices. And you’re right, the all-wheel-drive would be great for gravel roads. Another vehicle to look at would be a late-model Ford territory diesel which is big and clever inside and has the option of all-wheel-drive. The diesel engine is a plus on the bush where that fuel is more readily available (in really remote areas) and gives you more range for big holidays in the mulga.

Don’t rule out things like the Mitsubishi Pajero, either, which won’t be as around-town friendly, but is a proven quantity and is absolutely tremendous off-road. The same goes for a Toyota Prado or Nissan Pathfinder prior to the current model (which is a bit less hard-core adventure).

You’re on pretty safe ground with the diesel Territory, as long as it is in good condition, and has been regularly serviced as per Ford’s recommendation.