Assess proximity to ports and rail, WMS and order-management integration, SLA performance (pick, pack, ship times), returns processing, contingency capacity for seasonality, carrier partnerships, and customs/brokerage capabilities. Verify technology APIs, reporting cadence, and onboarding timelines to align service levels with customer promises.

Port proximity and seamless rail/highway links reduce drayage, shorten transit times, and lower inventory-in-transit costs. Locating DCs near intermodal hubs in the region can reduce last-mile miles to key markets, improve turn rates, and enable lower safety stock. Model landed-cost vs. service-level trade-offs by SKU and lane.

Require robust WMS and OMS integration, reliable pick-and-pack accuracy, multi-carrier shipping options, returns and reverse-logistics workflows, kitting/assembly, temperature control when needed, and real-time inventory visibility. Ask for case studies on same-day/next-day fulfillment and peak-season scalability.

Compare fixed costs and capex of self-warehouse against variable, usage-based 3PL fees. Consider throughput variability, seasonal peaks, headcount and management overhead, technology investments, and time-to-market. Run a TCO analysis including service levels, inventory carrying costs, and flexibility to scale down or expand.

Key considerations include customs brokerage capacity, bonded warehousing options, accuracy of import/export documentation, tariff classification and valuation, ACI/ACE filings, and rules of origin. Ensure your 3PL has certified brokers, established carrier compliance processes, and clear workflows for detention, demurrage and bonded inventory handling.