Caravan
I remember a danish registered example operating from Barton airfield, Manchester a few years ago, the owner was English I believe and used it on fish/ freight flights in Scotland and Scandinavia.
Seen loads of caravans in all sorts of guises in my travels, loads of potential and such a shame that the small carriers in the UK cant take advantage of the design, surely Fed Ex cant be wrong and I dont hear stories of those falling out of the sky with engine failures !
So for now the only caravans that we wil experience in the UK are the 2 wheeled variety blocking the holiday routes !!