I waiting on my friend to send some info up. Expected details by now. The coolthing is that you can stack them and that they make the same tank for water so that can stack right there as well (put a water tank on top of the gasoline tanks for that automatic fire extinguisher effect

)
I doubt they will be "cheap" but might be a nice investment if they are built well.. Compared to the $1055 I was quoted for a built in water tank for my deefer even $500 sounds pretty good.
As soon as I here something I will post it up.