Challenger MT700 series: The four-model 235-306hp Caterpillar Challenger MT700 series tractor range was introduced back in 2002, superseding the Challenger 35/45/55 models. Today, early MT700 units are starting to appear on the used market, albeit in relatively small numbers. So, if you’re looking for a second-hand MT for 2009, put the feelers out now. James de Havilland reports