Which preposition to use with shiploads

of Occurrences 33%

When a shipload of these poor creatures leaves Honolulu for the little Isle of Molokai there is great wailing by the relatives of those sent away, for they know the parting is final.

from Occurrences 2%

There are thousands of men employed, and in one year over three million salmon were packed, yet with all this work for busy hands to do, the canneries employ Chinese, Greek, Portuguese, and American workmen in preference to the Indians, bringing them by the shipload from San Francisco.

across Occurrences 1%

The greedy nobles and landed gentry, who grabbed the ancient foundations of the old religion, cared nothing for the books they found cumbering the walls, and either devoted them to vile domestic uses or sold them in shiploads across the seas.

Which preposition to use with  shiploads