You could be right! 
Martin, you can get 8 in. There won't be much room for anything else though. That is why I use the rear seat area (with the seats folded out of the way.)
i used to use barrels in my old VW passet estate then my fiat marea weekender estate, i knew it was about the same sized boot area
you can get some nice folding sack trucks thses days, add to it a pump box and a battery and you would be able to work out of the berlingo multispace fairly well with the seats in place ( as i guess Martin ccs is planning to do )
the berlingo has a really tall roof space, so you would be able to put stuff on top of the barrels