Prioritize SLA definitions (order cycle, dock-to-stock), verified cold-chain certifications, evidence of carrier diversity, and real-time WMS/OMS integrations. Assess handling equipment, heated or refrigerated storage capacity, labor availability during peak seasons, and clear KPIs for shrink, on-time shipments, and order accuracy.

Compare dock door counts, yard space for trailers, roll-on/roll-off or breakbulk capabilities, bonded and hazardous storage if needed, plus direct carrier callouts. Evaluate nearby highway access, turnaround times for inbound/outbound shipments, and proximity to key customers or terminals to lower drayage and expedite deliveries.

Require regular reporting on order accuracy, perfect order rate, lead time distribution, dock-to-order time, inventory turns, and cost-to-serve per SKU. Insist on API access to WMS/OMS, daily pick/pack metrics, exception logs, and a structured review cadence to align incentives and control operational spend.

Seasonal demand and weather-driven access can raise labor and transport premiums and affect SLAs. Mitigate risk by building buffer inventory, using flexible contract terms with surge-rate caps, selecting providers with redundant carrier options, and negotiating contingency plans for alternative routing or temporary storage to protect service levels.