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Google: ITSDF.ORG for a free copy of ANSI/ITSDF B56.1-2005, Safety Standard for Low Lift and High Lift Trucks courtesy of the Industrial Truck Standards Development Foundation.

You should review:

4.2 Modifications, Nameplates, Markings, and Capacity (all) especially 4.2.3: "If the truck is equipped with a front-end attachment(s), including fork extensions, the user shall see that the truck is marked to identify the attachment(s), show the weight of the truck and attachment combination, and show the capacity of the truck with attachment(s) at maximum elevation with the load laterally centered )," ITSDF

4.17 Elevating Personnel (all) especially 4.17.3 (o): "The combined weight of the platform, load, and personnel is not to exceed one-half of the capacity as indicated on the nameplate of the truck on which the platform is used." ITSDF

7.37 Platforms: Elevating (all) especially 7.37.4 (b): "Hydraulic or pneumatic hoisting systems shall include means to prevent unintended descent in excess of 0.6 m/s in event of a hose failure." ITSDF

If you are considering the work platform for normal production order picking, you may want to consider an order picker type truck which only requires one operator and is designed to perform such activity.