in 2013, here in the USA, the rules changed somewhat,not to allow more than 1 operator, but to put specific weight limits on the type of harness/belt/lanyard used in man up powered industrial trucks, and on the maximum weight an operator may be, before they are disqualified by/from the physical limits..
I think you can look at the standards on itsdf dot org (the industrial truck standards development foundation's website).
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