Best way to segment B2B customers in last-mile delivery?

Beyond size, I'd look at delivery frequency + urgency tolerance + order predictability — those three usually cluster B2B customers way more meaningfully than firmographics alone. In last-mile specifically, whether a client is time-definite vs. cost-sensitive vs. high-returns tends to drive totally different service needs. A simple RFM-style matrix adapted for delivery behavior (regularity, frequency, margin) can get you there pretty quickly without overcomplicating it.