Focus on measurable KPIs and contract terms: order cycle time, on-time shipment rate, inventory accuracy, return-processing time, and chargeback rules. Evaluate minimums, SLA penalties, billing transparency, and scalability clauses. Consider network simulation of transit times and landed-cost impact before committing.

Require a modern WMS with real-time inventory, EDI/API integrations, accurate slotting and pick-path optimization, and returns-management workflows. Confirm connectivity to major carriers, secure facilities, cold-chain or specialized storage if needed, and clear automation roadmaps for throughput scaling.

Map transit-time isochrones and overlay customer density to assess coverage. Review carrier contracts and on-site carrier access (parcel, LTL, FTL), cross-dock capabilities, and frequency of departures. Run sample lane cost comparisons and check last-mile partners for key delivery ZIP codes.