For large structures, SOC (Shipper Owned Container) or Flat Rack containers are common, but detachable/flat-pack designs are the most economical as they allow 4-6 units to fit into a single 40ft HC container, significantly reducing the freight cost per unit. When shipping to countries like the US, UK, or Australia, choose DDP (Delivered Duty Paid) if you lack an import license, or CIF (Cost, Insurance, and Freight) if you have a reliable local clearing agent. Ensure the supplier provides a detailed packing list and assembly manual (or video) to facilitate quick customs clearance and installation.