Insulated boxes can be manufactured and installed on most light delivery vehicles available on the market.
One option available is to remove the payload and to fit a new chassis on which the insulated box is fitted. A refrigeration unit can then be installed that runs of the vehicles engine and a 220v standby option is also available.
Another option is to build a portable insulated box that slides onto the existing payload, mostly between the wheel arches.
220v refrigeration units can also be fitted to these boxes if needed.