When selecting a shipyard transporter (often a Self-Propelled Modular Transporter or SPMT), the most critical factor is the Payload Capacity, which can range from 50 to over 1,000 tons. You must verify the Steering Modes (e.g., carousel, crab, or 90-degree steering) to ensure maneuverability in tight shipyard docks. Additionally, check the Suspension Stroke (typically 600mm+) to ensure the vehicle can lift and level heavy hull sections on uneven ground. Ensure the power unit uses Tier 4 or Stage V compliant engines if shipping to regulated markets like the US or EU.