Rob, agree on the "open" draw bars, not seen before. They most likely swapped the axle for a new one with hubs to match the wheels during the upgrade. Maybe the chassis was damaged and was fitted with replacement draw bars?
The archive caption states "Waterzuiveringsinstallatie Dominion Truck Company" - or water purification installation (built by?) the Dominion Truck Company - as far as I know that is the company in Kitchener, Ontario which also built bodies for the FWD SU-COE MAT. They also built 6 ton 2 wheel GS semi trailers that I know of.
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Regards,
Hanno
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