Centre of weight distribution fore & aft

We are building a custom cradle for a heavy duty 3 axle trailer and need to calculate the tongue weight correctly. In order to do that, the welder needs to know the centre point of the BCC weight wise.

Is there a published specification anywhere or has anybody figured this out?

BCCIB 4-1 Lifting and Blocking 2022r.pdf (782.4 KB)

If by ‘centre point’ you mean the Longitudinal Centre of Gravity LCG then see the discussion of the Longitudinal Centre of Gravity on pp. 4-1-4 and the summary of reference points on pp 4-1-7 to 4-1-8

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That is a great document. I notice this one is numbered 4-1. What other documents are available?