BENEFITS ARE OFTEN BETTER SPACE UTILISATION AND/OR IMPROVED CARGO HANDLING
These containers often include additional or alternative doors for improved accessibility to the commodities.
Side doors or side opening containers are sometimes required for storing entire airline containers with sensitive cargo and especially pharma products that can be easily damaged in hot climates.
Dual machines for safety against possible refrigeration failure. Most often these are for extremely dangerous cargoes like self-igniting chemicals and fuels or where content value is extremely high.