In reply to CMcBain:
The Vivaro/Trafic/Primastar vans from about 2007 to 2010 had issues with water pooling on top of the engine and corroding the injectors. There is a Watchdog report about it; the companies concerned have offered various levels of compensation. I've got a 2009 Trafic and it set me back £700. Buggers.
I've a SWB Trafic Sports crew van with the back seats out. Decided not to go the full 'conversion' route as a folding bed, folding table, and a couple of sets of plastic drawers have me perfectly set up. With room for another bed. And I can easily strip it out to have a load carrier or put the seats back in and have a 'mini-bus'.