The problem is always multi-modality. Switching modes of transport increases cost and complexity. The volumes also needs to be very large for it to be worth i

The problem is always multi-modality. Switching modes of transport increases cost and complexity. The volumes also needs to be very large for it to be worth it. Switching from just point to point trucking to truck -> ship -> truck needs to have extremely large efficiency gains in the ship portion to be worth it.