A reefer (caja refrigerada) is a temperature-controlled trailer with its own refrigeration unit, used for produce, food, pharma, and any freight needing a set temperature. Cross-border, reefers carry Mexico's produce exports north and temperature-sensitive goods south.
A reefer, caja refrigerada or simply 'el refrigerado,' is an insulated trailer with a diesel-powered refrigeration unit that holds a set temperature, chilled or frozen, across the trip. It is the mandatory equipment of produce, protein, dairy, certain chemicals, and pharmaceuticals, and the temperature record it produces is part of the freight's documentation.
Cross-border, the reefer is the vehicle of one of the continent's great freight flows: Mexican fruits and vegetables moving north, concentrated in the winter and spring produce season through crossings like Nogales, Pharr, and Laredo, plus temperature-sensitive manufactured and food products moving south.
Reefer freight stacks every cross-border complexity plus a running clock and a temperature record. The disciplines that separate professionals: pre-cool verification before loading, continuous versus cycle (start-stop) operation set explicitly and written on the rate confirmation, fuel management for the unit across border queues, where an idling wait is exactly when a low tank becomes a claim, and clean temperature downloads delivered with the PODs. Northbound produce adds FDA prior notice and agriculture inspection exposure at the port. Reefer capacity runs structurally tighter than dry van on cross-border lanes and reprices hard in season, so the shippers who lock committed reefer capacity before the season starts are the ones still shipping calmly in the peak weeks.
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