ISO 22915-4:2009 specifies tests for verifying the stability of pallet stackers, double stackers, and order-picking trucks with an elevating operator position up to and including 1 200 mm lift height. 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.