This week Oliver Dixon's World Trucks blog is coming from the Mid-America Trucking Show in Louisville, Kentucky, where there's a surprising amount of stuff that is of interest to us Limeys - the DAF XF105 made a surprise appearance, while parent firm Paccar showed off the MX engine, and Cummins has introduced a 600hp version of the ISX. Interestingly, too, there are plenty of different views on the health of the US truck market.