Prioritize WMS compatibility and API integration, SLA-backed pick-and-pack throughput, real-time inventory visibility, returns management, and flexible labor models. Also verify value-added services (kitting/labeling), peak-season scalability, and transparent billing for storage and accessorials.

Transit times and carrier density determine order-to-delivery SLAs and routing logic; closer proximity to regional hubs reduces LTL costs and improves delivery reliability. Assess primary carrier options, transit lanes to key consumption centers, and intermodal transfer points when designing distribution zones.

Negotiate clear rate cards (storage, pick/pack, inbound/outbound), minimum volume commitments, seasonal rate caps, accessorial definitions, and service credits for SLA breaches. Include indexed pricing clauses for fuel and labor to manage cost volatility.

Conduct site audits for physical security and inventory controls, review certifications and insurance, request WMS demos and API sandbox access, run pilot SKUs to test pick accuracy and reporting, and validate cycle-count and reconciliation procedures before full-scale onboarding.