The two-model Case IH Optum CVX range spans the power and size gap between the Puma and Magnum lines. Three hundred horsepower to pull a trailer? That sounds excessive, but it is one of the roles envisaged for a new breed of powerful tractors that makers say are not so big as to be confined to field work. Just as fertiliser spreading used to be the preserve of 80-100hp tractors, but is now frequently undertaken by machines in the 200hp class, so haulage and other jobs once exclusively handled by those tractors are being handed to bigger, heavier, more powerful machines. It is a matter of convenience as much as anything. With fewer operators driving bigger tractors handling wider tillage and drilling equipment to gain economies of scale, so equipment for transport, spreading and spraying are being up-scaled to match the capabilities of those power units. Claas Axion 870 CMatic is a new addition to the Axion 800 range with up to 295hp for pto and transport operations, and when there a major demands on the hydraulics. On the face of it, running a 280-320hp tractor on a trailer sounds bonkers; but if it saves running additional smaller tractors that will stand idle at others times,...