As nouns the difference between tunnage and dunnage
is that tunnage is while dunnage is (chiefly|transport) scrap material, often wood, used to fill spaces to prevent items from shifting during , or underneath large or heavy items to raise them slightly above the ground.
dunnage
Noun
(en-noun)
(chiefly, transport) Scrap material, often wood, used to fill spaces to prevent items from shifting during , or underneath large or heavy items to raise them slightly above the ground.
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Personal effects; baggage.