Best way to segment last-mile delivery customers for a pricing study?

For last-mile pricing studies, I've had the most success segmenting by a combo of shipment frequency AND sensitivity to delivery speed — volume alone misses a lot. A simple RFM-style cut (recency, frequency, monetary) gets you started, then layer in a willingness-to-pay question or two to spot the price-sensitive vs. service-first clusters. Conjoint works really well here if you want to quantify how much each segment actually values speed vs. cost tradeoffs.