The industry standard for industrial trucks, sold in the USA, (and a placard is attached to each new truck stating this) is the "b56" standard. Older trucks were covered by the ASME b56.1, and since about 2004, the "Industrial Truck Standards Development Foundation (ITSDF.org) has taken over the responsibility of upkeep and update of the standard.
You can download the standard from the ITSDF.org website for free.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.