Out Sydney way a few years a go I filled up a 1000ltr fuel trailer. I had 2 pumps going into it pretty funny to see, it took ages. Cost like $1260 ish I wouldn't wanna do it now or in uluru haha. Most I ever paid was like $1.90 In a little town in NSW, the f truck was dedicated gas so I had to get the gas at the town before. It cost about 96c a litre an the truck had 300lts to burn through, not worth having LPG. This was only 2 hours or so west of goulburn so not too far from civization. Had no mobile or TV reception which was awsome!