Holman PACKOUT Extra Shelf Model 48266Holman PACKOUT Extra Shelf Model 48266 The Holman ProStow shelving system is designed to organize and access Milwaukee Packout Storage System within a van. The slide out shelves allow for easy and ergonomic access to each unit. This addon shelf allows for custom configurations including the ability to have up to 6 toolboxes in one Prostow unit. Features and Benefits: Easy access to each Packout unit without having to unstack them or remove them from