A refrigerated trailer, and the freight that moves in one.
Temperature-controlled work pays better than dry van and costs more to run — the unit burns its own fuel and needs its own maintenance.
Reefer freight is seasonal and claim-sensitive. A temperature excursion on a produce load is a claim, not a shortpay, and the numbers get large.
Related
Inteleri works out what a load actually pays you once things like this land. See how it works.