They appear to be RAAF Fire Trucks. The type started life as RAAF fire truck design and constuction project, but then the war ended, so the majority of the contract were transferred to Army for use as Ordnance Vehicle Park (OVP) 'self contained' fire trucks, so only a small number were actually used by the RAAF. Some (unknown number) were later transferred to Dept Civil Aviation post-war, when airfields were still government operated.
Civilian type tyres were a common feature on both wartime and post war vehicles when the tactical environment allowed it. The type often used in Australia was the Dunlop 'Silent 90'.
Mike C
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