Only slightly relevant but may help to confirm demob use. The vast majority of 3 ton CMP vehicles in Australia that were used commercially on road were converted to dual wheel configuration (750X20) because, no matter the tyre size, single wheels were restricted in legal load to less than duals. This has only been readdressed in very recent times by the introduction of "super singles" on heavy trucks, particularly on semi-trailers.
750X20 tyres were readily available from US vehicle stocks (as well as being a standard civilian size of the period)
No doubt it made the trucks lighter on the steering.
While the farmers (except those carrying grain on road to silos who generally had duals) and off-road users stuck with the original army tyres the commercial operators went for the increased allowable payload. Purely economic decision.
Perhaps the UK regulations of the period encouraged such a conversion for economic reasons?
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