Spreader plates should always be used with boom-type aerial work platforms (AWPs) when fully supported on their outriggers.
http://www.ipaf.org/spreaders
International Powered Access Federation - IPAF.org
http://www.ipaf.org/en/publications/films/
The International Powered Access Federation (IPAF) promotes the safe and effective use of powered access equipment worldwide in the widest sense -- through providing technical advice and information, through influencing and interpreting legislation and standards, through its safety initiatives and training programmes.
