Very interesting and well spotted!
But I would place my bets on a converted HUP. I have pictures of a C15 with coach built front doors like on the subject HUP so it has doors with proper sliding windows (photos to follow later). Likewise the single rear door could have been replaced by coach built doors to give better access.
Bear in mind that in post-war Holland there were a lot of coach built conversions to make surplus Army trucks better suited to post-war civilian needs.
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Regards,
Hanno
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