A "reefer truck," then, is a semi pulling a refrigerated trailer, designed to haul perishable goods. These trailers differ from cooling vans, which are just insulated and vented. ... Reefers include an active cooling system. Thus, you can transport frozen as well as refrigerated freight.

What does a reefer do?

In trucking, a “reefer” is a refrigerated trailer that gets attached to a semi-truck in order to transport perishables and other temperature-sensitive goods.

What is a reefer in a truck?

What is reefer freight? The “reefer” in reefer freight is an abbreviation of “refrigerated.” If you need to maintain the cargo temperature in transport, you ship it in a reefer truck. Reefer loads come in full or partial trailer loads and less than truckload (LTL) lots.