I have been looking at water tanks to fit between the back seat and cargo barrier in my GU Patrol Wagon.
I have looked over the past 5-6 months and found them very pricey in my opinion for what your getting considering the storage capacity.
I can purchase one from the company who make my drawers, manufactured from stainless, which costs $650-$700 but only holds about 45-60L.
Many other tanks that are available are either too deep, too long or too high. They do not hold sufficient water and don't use up the available space efficiently etc etc.
I stumbled across a small business called Abber Tanks. A fellow by the name of Chris in QLD operates it. I found out through a fellow at work.
He uses food grade material (plastic / PVC Poly stuff) and can custom design everything you need.
My tank, custom designed to fit the space efficiently including baffles etc and fittings will cost me $365 delivered to my door and will carry 67L approx.
I have yet to take delivery and he said 7-10 days depending. Currently looking at delivery about the week of 25 Mar 13 as he is busy this week.
Figured I'd post it here to see who else knows about him, or if someone has experienced the issue I had with not being able to find the right tank for a suitable price.