Prioritize facility layout (dock count, clear height), inventory management systems (WMS with API capabilities), SLA performance (OTD, pick accuracy), carrier integrations, and proof of handling for returns. Also evaluate scalability options, security, and local labor availability to align with your growth plan.

Model landed cost by combining port-to-warehouse drayage, intermodal fees, last-mile delivery rates, and inventory carrying cost. Compare current transit times to projected door-to-door lead times from the 3PL location; use historical carrier ETAs and warehouse processing time averages to estimate improvements.

Require a WMS with real-time inventory visibility, order management that supports channel orchestration, EDI/API integrations with marketplaces/carriers, barcode or RFID scanning, and configurable workflows for returns and value-added services. Ask for uptime SLA and sandbox access for testing.

Negotiate transparent rate sheets for storage, pick/pack, inbound receiving, and returns; minimum volume commitments; short notice scalability clauses; KPIs with financial remedies for missed SLAs; and IP/data ownership terms. Include audit rights and clear demurrage/detention responsibilities.