Prioritize WMS/API integration, committed SLAs and KPIs (OTD, accuracy), dock and racking capacity for peak volumes, inventory accuracy and cycle-count processes, and carrier connectivity for domestic and regional lanes. Also assess returns handling, kitting capabilities, and any required cold-chain services.

Optimize SKUs by velocity and carrier lanes, position high-turn items closer to demand corridors, and use hybrid inventory pools across regional nodes. Implement demand sensing with the 3PL's WMS to shorten re-stocking windows and reduce average miles per delivery, lowering freight and handling costs.

Require a cloud-native WMS with real-time inventory, barcode/RFID support, standardized EDI/API integrations, slotting and pick-path optimization, and dashboarded KPIs. Also verify physical capacity: dock doors, racking density, staging areas, and contingency plans for seasonal peaks.

Choose 3PLs experienced in customs facilitation, bonded or transit storage, and fast cargo clearance workflows to reduce dwell time. Validate their documentation accuracy, HS code management, and partnerships with customs brokers and regional carriers to prevent delays and unexpected duties.