Have one of these between rear seats and drawers.
http://www.dolium.com.au/libraries/i...nks/wtp50t.jpg
Had to cut lower section out of Milford cargo barrier to fit it but very happy with it as it's totally invisible and out of the way. Has always done me well on outback trips but am also looking to buy a bladder for extra water security. Can never have too much water out there.url]