Warren
In case the Bailey Bridge sections misled you, the images posted by Rick C are both tippers, just different models. The Aust Army's CMP range of trucks during WW2 had only one series with duals as standard as far as I'm aware: tippers. Post war, some No.6 LAA tractors were so fitted as well, with Units equipped with both single and dual wheel-ed tractors.
Tyre size for tippers with duals was 8.25x20.
The spacers for the front wheels were essential to retain the steering geometry (king pin angle to point on the ground where the centre of the tyre was)
Regards
Mike C
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