A person who loads, arranges, or manages cargo placed on top of a cart, or something that performs as the top item or layer of a cart.
From 'cartop' plus the agent suffix '-er' (one who does). This occupational term emerged in medieval and early modern commerce when specialized roles developed around cargo management and transport.
Being a cartopper was a skilled job—one mistake in balancing the weight distribution on a cart's top could cause goods to shift and tumble, leading to damaged merchandise and financial loss for merchants.
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