An old friend of mine had a smart solution to this problem --- he bought the trailer part of a petrol tanker, and parked it convenient to his ramp.
Had all the right piping for filling.
As a "vehicle" that was not "fixed" there were no council approvals required, and no bunds. As it was never to be used on the roads again, no rego. or other RTA requirements.
His insurance company was happy.
And all the right piping and pumps (after some minor mods) for delivery.
It also meant he could buy a whole "tanker" of fuel in one go, the difference in price compared to buying smaller part loads was substantial, he bought direct from the oil company regional wholesale distributor, not from a retail agent.
Tootle pip!!