A removable blocking device for preventing disengagement of an upright leg from a base member of the load carrier. The base member can have a receiving passage in which the upright leg reciprocates. The removable blocking device can include an interference portion releasably couplable to a lower distal end of the upright leg, the interference portion can have a dimension that is greater than a corresponding dimension of the lower opening to the receiving passage. The interference portion can have an abutment surface configured to blockingly engage the base member proximate the lower opening to the receiving passage. A lock contained at least partially within the removable blocking device, the lock being transitional between a locked configuration in which the removable blocking device is locked to the upright leg and an unlocked configuration in which the removable blocking device is released from the upright leg.