An outer guard assembly or system is described, which may be used in transport units, such as for example in transport refrigeration including the units and/or systems thereof. The outer guard assembly or system includes transitions components to facilitate mounting to a trailer or container of a transport unit, so as to shift or transfer load of the mounting from the transport refrigeration unit to the trailer or container, on which the transport refrigeration unit is mounted. The outer guard in some examples includes an openable mechanism to provide clearance, such as for example to open and/or access doors, panels, equipment, and components of a transport refrigeration unit.