well there is nothing wrong with the tank itself, pointless reserve 'Buy Now' price though, brand spanking new they are not much more than that.
I have a 650 litre version of the same type of tank, except mine lies flat and not upright.
It is set in the middle of the van and not over the axle too!
Plus it has a cage bolted to the floor holding it down!
That setup is awful, but the tank is good.
Ian