Assess facility layout, racking and batching capacity, IT integration (WMS/API), inventory accuracy, order cycle times, and throughput during peak periods. Also confirm carrier lanes, cross-dock capability, and SLA terms for lead time, returns, and damages to align with your eCommerce or B2B service promises.

Compare landed cost models including storage, pick-and-pack, inbound handling, and parcel/LTL rates. Model transit time reductions and freight consolidation savings versus centralized fulfillment; include inventory carrying cost, safety stock reduction potential, and expected decreases in transit exceptions.

Verify experience with customs documentation, bonded or temporary storage options, tariff classification support, and local compliance processes. Confirm the 3PL’s preferred carriers for border lanes, transit times for checkpoints, and contingency plans for documentation delays.

Require WMS with API connectivity for order management systems, real-time inventory visibility, ASN and EDI support, and configurable reporting for fill rate, dock-to-ship times, and return metrics. Ensure the partner can provide automated alerts and KPI dashboards aligned to your SLA targets.