That semi-trailer is a refrigerated unit.
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Yep if it has the internals, compressor, coils, evaporated
etc installed in the housing compartment.
Lots of info we don’t have in this entire operation and event.
Everything is unitized in one packaged “unit” that bolts on the front except the fuel tank, lines and monitor gauge set. To install one you just cut out the pull and push air port holes through the trailer front, bolt the unit in place on the outside, install the air duct shroud and overhead “chute” on the inside, then the tank and lines under the frame.
Thing is though... You have to have an insulated trailer to begin with before retrofitting. A couple trailer manufactures sell trailers that are insulated but sold as dry vans and can be retrofitted if needed later.