Prioritize tangible operational metrics: lead times, dock capacity, peak handling throughput, WMS integrations, and order accuracy. Consider contract terms for scaling, value‑added service capabilities (kitting, returns processing), and real-world SLA performance data. If helpful, request a site tour and sample KPI reports to validate capabilities.

Model landed cost leveraging zone-based parcel rates, regional LTL lanes, and inventory carrying costs. Compare total cost-to-serve scenarios including storage, pick-and-pack labor, packaging, and outbound freight. Use a 90‑day pilot volume to validate assumptions and negotiate minimums, billing cadence, and accessorials.

Look for multi-channel WMS functionality, configurable pick paths for B2B pallets and eCommerce piece-pick, dedicated receiving and returns areas, integrated parcel carrier contracts, and flexible slotting. Ensure the provider can present robustness in inventory visibility and support EDI/API integrations for channel-specific workflows.

Carrier connectivity directly affects transit times and shipping cost. Assess on‑site carrier manifests, proximity to parcel and LTL hubs, frequency of pickups, and partnerships with regional carriers. Ask for sample transit maps and average transit-times-to-primary zip-code clusters to validate promised service levels.