Another expert chiming in here..

I did what you're asking on a smaller scale using my CK20s at the time. I was moving 50 gallon drums of sap.
Without question I would recommend if you're travelling any distance hang the container off the back not the loader. Lots of reasons, better for the front axle to start, better traction in likely messy conditions, rear end is much better at taking a large load and then you don't need to have an additional load of a counterweight on the tractor while travelling. Also maneuvering is much easier with the container on the back vs out on the forks of the loader. (if you're on a windy trail in the woods.) All better for the tractor.
If possible I would suggest testing the lift capacity on the loader with a full container (fill it with water) - you will be near the max of the loader when you add on the weight of the fork attachment... It will likely lift it a bit but you might not get max lift depending on how close or past the max lift you are at. There is another loader option for your tractor which lifts a lot more but I don't know if that's an expense you would want to take on at this point.Of course if it lifts it high enough then you're all good.
Look forward to pics! I keep debating an RO system for my tiny setup...
E.