When I was working in the Simpson 55 years ago, we had our fuel delivered by Mac Clark, the proprietor of the nearest station, 'Andado'.
He had one of very few Leyland Super Hippo 6x6s ever built. He carried fifty drums on it, towed a 6 wheel dog trailer behind it with another 50 drums (the whole outfit on 20.00x20 Michelin radial sand tyres). He would drop the trailer at the edge of the sandhills, and carry fifty drums to our camp, unload them, go back to the trailer, transfer all the drums to the truck, come back to camp, unload, then head back out, picking up the trailer on the way home. Nobody thought anything of it at the time, but it must have been pretty hard yakka for him, especially in mid summer. No helper, no aircon. I can't remember whether he carried a radio, but I doubt it - I would have remembered it I think.

