Thanks 747_not_777 - we're going to Las Vegas for a few days near the end of our US trip, and fancied a trip over to Death Valley. I'd been before in an Avis Toyota Rav4 that was surprisingly fun, although we didn't try anything serious like getting to the racetrack. Fancied something a bit more up to the task this time, but it sounds as if Farabees Jeep Rental will be the answer.