Prioritize service metrics and network fit: transit times to core customer zones, carrier mix (parcel, LTL, TL), fulfillment throughput, IT integration (WMS/APIs), peak‑season labor plans, and returns handling. Also evaluate cost‑to‑serve analytics and SLA remedies to align commercial expectations with operational capability.

Closer proximity reduces drayage and linehaul costs, shortens lead times for inbound inventory, and increases routing options. Access to high-density highways and nearby port/airport options improves carrier competition and can lower average transit days — particularly important for just-in-time and omnichannel replenishment.

Critical capabilities include distributed inventory footprints, scalable pick/pack resources, integrated returns processing, real-time inventory visibility, and carrier-neutral shipping to optimize cost and delivery speed across B2C and B2B channels.

Ask for a full cost breakdown (storage, receiving, pick/pack, outbound, value‑adds), examples of cost‑to‑serve models, ramp plans for seasonal volume, integration test timelines, and references demonstrating how the 3PL handled surges or contractual SLA penalties.