Slapping a bold MF sticker on to the fuel tank of an Arctic Cat ATV may seem like a small step by Agco. Not so fast, though. It also represents recognition from one of the leading tractor makers that ATVs have a place on farm, and not just in the UK. Here James de Havilland looks at the MF 400 manual, one of nine models in MF’s 250-500cc ‘AgTV’ line