As you’d expect of a big, van-based MPV, there’s lots of space inside and seating for up to nine. It also promises better economy, lower emissions and more tech. We’re testing the long-wheelbase version (2.0 TDCi 310 LWB Titanium) but, given the Tourneo Custom’s heft, is an engine with power output of just 128bhp up to the job of towing? Will size and weight guarantee stability at speed? And how’s the fuel economy?