ISO 22915-4:2018

This part of ISO 22915 specifies tests for verifying the stability of
-  pallet stackers,
-  double stackers, and
-  order-picking trucks with an operator position elevating up to and including 1 200 mm lift height, measured from the ground to the floor of the platform.
It is applicable to these types of industrial truck, whether with tilting or non tilting masts or fork arms, having a rated capacity up to and including 5 000 kg.
It is also applicable to such trucks operating under the same conditions when equipped with load-handling attachments and to order-picking trucks with an elevating operator's position up to and including 1 200 mm lift height when equipped with an additional load lifting device(s).