Require a proven WMS with real-time inventory visibility, reliable EDI/API integrations to your storefronts and TMS, documented inventory accuracy metrics, and SLA-backed order cycle times. Confirm peak labor scalability, automated sortation or pick technologies where relevant, and clear reporting cadence for KPIs such as OTIF, inventory accuracy, and order cycle time.

Proximity to trunk highways and ports lowers drayage and line-haul costs while higher carrier density improves rate competitiveness and service windows. Better modal access (truck, rail, port) reduces dependency on a single lane, shortens delivery zones for last-mile carriers, and can materially cut transit days and shipping cost per parcel.

Include clear SLAs for order accuracy, on-time pick/pack, and dock appointments; fee structures for storage, labor, and value-added services; defined volume minimums and surge handling; periodic performance reviews; chargeback rules tied to KPIs; and explicit provisions for capacity expansion or exit terms to protect scalability and cost predictability.