Prioritize WMS/API compatibility, SLA metrics (order accuracy and cycle time), inbound/outbound dock capacity, pick-and-pack throughput, and carrier network diversity. Also verify labor flexibility, slotting optimization, returns processing, and the provider's experience with peak-season scaling to maintain service levels.

Location near major arterials shortens last-mile routes, reduces zone counts and LTL surcharges, and tightens delivery windows. Proximity to I-94 and Chicago carrier hubs lowers transit times and freight spends, enabling lower safety stock and faster replenishment for regional fulfillment.

Require robust WMS with lot/serial tracking, real-time inventory APIs, EDI/portal capabilities, and barcode scanning. For regulated goods, confirm temperature monitoring, chain-of-custody processes, OSHA/compliance records, and documented quality controls to mitigate risk and ensure traceability.

Typical components include pallet or cubic-foot storage fees, per-pick and per-order charges, receiving and putaway fees, kitting and returns fees, minimums, and accessorials (fuel, detention). Freight management often uses pass-through rates plus a handling fee or margin; confirm invoicing cadence and audit rights.