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In dense countryside, with high bushfire dangers, Russell would never walk away and leave a fire burning.
Rob knew straight away something unforgiving had happened.
Fire expert ... not a lot of heat to the vehicle, very hot quick fire to the tent (possible accelerant) then put out quickly. Car tyres showed no signs of scorching, esky under truck showed no signs of scorching.
Rob says gas bottle would never be put in tent, always in Russell's truck or under his truck. Always, had a set way of setting up camp. How did the gas bottles get in the fire. If they were turned on, they would have made a quick and hot fire.
Fire expert checked to see if tent would burn, every time he tested by setting it alight, it would go out.
If gas bottles were turned on, they would have kept igniting the tent until it all burned.