Prioritize measurable SLAs (order accuracy, OTIF), warehouse management system (WMS) integration, real-time inventory visibility, pick/pack and returns capabilities, and scalable footprint. Also assess dock capacity, seasonal labor availability, and proximity to main trucking routes to balance cost-to-serve and transit time.

Trucking to Bangkok and Laem Chabang is the primary cost driver; expect competitive inland rates but longer transit than central provinces. Feeder trucking to ports is common, with cross-border freight to Cambodia achievable via established road links. Modal choices and consolidation depth determine final cost-to-serve.

Top 3PLs typically offer batch picking, zone and wave strategies, kitting, returns processing, basic light assembly, short-term storage, and SKU-level inventory reporting. Evaluate their ability to integrate with your order management and marketplaces for accurate omnichannel fulfillment and reporting.

During trials, validate system integration, run pilot SKUs, and measure KPIs: order accuracy, cycle time, receiving-to-stock lead time, dock-to-despatch turnaround, damage rate, and invoice reconciliation. Include security audits, contingency planning for peak seasons, and a clear SLA with penalties and escalation paths.