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Freight shipping may be required if the items to be shipped exceed a particular weight. Freight shipping solutions exist only for the US and UK sites and only for domestic shipping.
Freight shipping options for US:
To specify "other freight service" via API, provide only the following in the ShippingDetails.ShippingServiceOptions container:
Since there isn't a way to list an item by specifying the freight shipping cost via the API, the item description should note that the seller and buyer will work out the shipping cost details outside of eBay.