DEANB:
Robert, Re the De Meulemeester ERF according to the company website it had a 350 bhp fitted.2
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Intrestingly they also operated a Bedford TM with a 320 bhp Detroit motor.
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In the LOWLANDS it was very common to buy directly from an exhibition, hence Amsterdam and Brussels exhibitions with new chassis.
I can only speak for Van Steenbergen, Gruwez and De Meulemeester that they all bought quite some chassis (ERF as well as WHITE in all cases)
directly (after some wining and dining from CDB after the exhibition. Probably the same with the quite unusual BEDFORD 6x4 for De Meulemeester.