Have you tried contacting the FLTA or CFTS?
We ran into this issue due to an over zealous insurance inspecter who failed a truck on fork drift and demanded to see in writing what the limits were, there's nothing in the thorough exam course notes.
From memory it's around 50mm or 2 inches in 5 minutes.
The FLTA/CFTS did send us a document in writing but I don't have access to it now as the company I was working for then no longer exists.
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