Any vehicle with air suspension can suffer failures of this technology, especially if they’ve been used hard in an off-road setting (which the original Cayenne was very well suited to). The good news is that air suspension failure should be relatively easy to spot as the car will settle into its lowest position if the suspension is letting the air out, say, overnight.

For the record, this generation Cayenne was only fitted with air suspension if you bought either of the turbocharged versions (the Turbo and Turbo S). The entry level Cayenne S was fitted with entirely conventional steel springs.

Other things to watch out for are coolant leaks from the plastic plumbing under the intake manifold while big, heavy, powerful cars like the Cayenne can be hard on tyres and brake pads. So check those things still have some life left in them, or budget for replacements.

Generally the cost will depend on the variant and year. You can get more information on quick and cheap key replacments from dealers or automotive locksmiths here.

Thanks for the email. Hopefully I can keep this simple. 

I would strongly recommend a Toyota Aurion V6 $30,990 drive away or the Toyota Camry $28,990 drive away (pricing current September 2015). 

Unless you want the acceleration of the V6 I would opt for the four cylinder Camry, which is spritely enough and will also deliver good open road fuel economy. 

For the type of driving you're doing you do not need the hybrid Camry. 

Also, the base model Camry on the smaller wheels and Michelin tyres will be much more comfortable and a touch quieter than the dearer Camry models that come with sports tyres. 

In both the Aurion and Camry you will be protected by seven airbags and a five star safety rating. A rear camera is standard on both models too. 

The servicing costs are among the cheapest in the business. 

Furthermore the intervals are longer than other Toyotas (15,000km rather than 10,000km) and the capped pricing lasts four years or 75,000, whichever comes first (other Toyotas are three years, 60,000km). 

This was done to help Aurion and Camry appeal to fleets. 

However, your warranty is the same as other Toyotas at three years/100,000km. 

Dealership extended warranties are generally not worth the paper they are printed on, so save your money if you're offered an extension. 

Please check you're comfortable when driving the Aurion and Camry. They have ample room inside and a lot of travel in the front seat rails. 

Meanwhile, you're right in your assumption that Toyotas are regarded as a premium over Holden and Ford. The price is cheap because Toyota is trying to keep the factory running until 2017. It is in effect making a loss with each Camry it sells. 

Toyota also has a vast rural dealer network so hopefully you're never far away from help should you need it. 

Lastly, the Camry was at $26,990 drive away for much of last year and the price may limbo to that level again in the lead up to the end of the year or early next, to clear 2015 stock. This is not an inside tip, merely an educated guess on my part.

Good luck and let me know if I can help any further. I hope I'm still driving big distances in my 80s.