Definition of "trundling"

[T]he inmates of the coach, by numerous hard, painful joltings, and ponderous, dragging trundlings, are suddenly made sensible of some great change in the character of the road.

1852 July, Herman Melville, “Book XVI. First Night of Their Arrival in the City.”, in Pierre: Or, The Ambiguities, New York, N.Y.: Harper & Brothers, […], section I, pages 312–313