All-American off-road firm Jeep is part of the larger Chrysler organisation, which has been through a turbulent few years. First the company parted ways with Mercedes-Benz, then the recession hit the firm harder than most, but now Chrysler's future is looking a lot more stable under Fiat ownership. The Jeep Grand Cherokee is something of a transition model, as it uses a platform that's shared with the Mercedes-Benz M-Class, but it's powered by a 3.0-litre V6 diesel that was developed by Fiat. There are two trim levels on offer - Limited and Overland - and both are well equipped: If you bought a similarly priced Land Rover Discovery 4, you'd have to spend a lot of money on extras to get it to the same level of equipment. The Grand Cherokee is superb when you head off road, but rivals are better on tarmac.