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A side note - the accepted method of road train drivers in the outback for checking their tyre pressures is to walk around the rig with a length of pipe thumping each tyre - the "boing" sound gives an indication of pressure. When they have over 60 tyres to check (not including spares) you can understand why a quicker if slightly less precise method is used! (this is for a truck with 3 'A' trailers, some have more)
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