Prioritize network coverage (regional hubs and last-mile reach), SLA performance, WMS integration and reporting, facility types (ambient, cold, bonded), and value-added services (kitting, returns). Also review carrier contracts, peak-season capacity, and transparent cost-to-serve models to compare providers effectively.

Model cost-to-serve by SKU using transit time reductions, carrier rate differences (zone shifts), inventory carrying costs, and expected changes in return rates. Include handling fees, cross-dock opportunities, and reduced expedite spend; run scenario comparisons for hub locations and inventory splits.

Require real-time WMS API access, EDI or modern API order flows, inventory sync, and event notifications. Track OTIF, pick accuracy, dwell time, inventory variance, and order cycle time. Ask for dashboards, audit trails, and routine SLA reviews to maintain performance.

Request carrier manifests, transit time studies, reference shipments, and proof of negotiated parcel/LTL rates. Run a pilot with representative SKUs, verify pickup schedules, and confirm depot connectivity. Validate cut-off times and contingency plans for peak periods.