A collapsible wagon for cargo, comprising: a base; at least one wall (14, 16) that is pivotally mounted to the base and that pivots relative to the base between a folded position for storage and an unfolded position for use, wherein in the unfolded position the wall extends generally upward from the base to cooperatively form a container for holding the cargo; and at least one pivotal coupling (50, 52) that pivotally mounts the wall to the base, wherein the pivotal coupling includes an anchor fixedly mounted to the base and a pivot fixedly mounted to the wall so that the pivot moves with the pivotal wall, characterised in that the anchor includes a fixed housing and either two stop surfaces (68, 70) or a stop member internally contained within the anchor housing, wherein the pivot includes a pivotal housing and the other of the two stop surfaces (68, 70) or the stop member internally contained within the pivotal housing, wherein the stop member is positioned between the stop surfaces and pivots relative to the stop surfaces through an angular motion limited by contact with the stop surfaces to define the storage and use positions of the wall, and wherein with the stop surfaces and the stop member internally contained within their respective housings there are no exposed gaps between the stop surfaces and the stop member that get closed in a pinching manner when folding and unfolding the walls, further comprising an auto-positioning system that biases the pivot and the wall, relative to the anchor and the base, toward either the use position or the storage position, wherein the auto-positioning system includes at least one cam surface having a peaked mid-section with a tipping point between two ramps sloping down and away from the tipping point. a base; at least one wall (14, 16) that is pivotally mounted to the base and that pivots relative to the base between a folded position for storage and an unfolded position for use, wherein in the unfolded position the wall extends generally upward from the base to cooperatively form a container for holding the cargo; and at least one pivotal coupling (50, 52) that pivotally mounts the wall to the base, wherein the pivotal coupling includes an anchor fixedly mounted to the base and a pivot fixedly mounted to the wall so that the pivot moves with the pivotal wall, characterised in that the anchor includes a fixed housing and either two stop surfaces (68, 70) or a stop member internally contained within the anchor housing, wherein the pivot includes a pivotal housing and the other of the two stop surfaces (68, 70) or the stop member internally contained within the pivotal housing, wherein the stop member is positioned between the stop surfaces and pivots relative to the stop surfaces through an angular motion limited by contact with the stop surfaces to define the storage and use positions of the wall, and wherein with the stop surfaces and the stop member internally contained within their respective housings there are no exposed gaps between the stop surfaces and the stop member that get closed in a pinching manner when folding and unfolding the walls, further comprising an auto-positioning system that biases the pivot and the wall, relative to the anchor and the base, toward either the use position or the storage position, wherein the auto-positioning system includes at least one cam surface having a peaked mid-section with a tipping point between two ramps sloping down and away from the tipping point.