Roll-on/roll-off (RO-RO) ships are used for international heavy machinery mover if the machinery is on wheels and can be driven or towed onto the ship. RO-RO transportation is less expensive than other methods of moving heavy machinery. RO-RO shipping serves a limited number of ports. If your equipment will be transported to a port that does not service RO-RO ships, you will have to select another method for international heavy machinery moving.