Weight over 3 axle tractor unit

Hi,
Looking for info on how much I can put on trailer over tractor unit. Had to load some pallets at 1250 kg so I put;1 in the middle then 2 then 1 then the rest, 18 in total.

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I Would have probably gone 1 2 1 2 1 2 etc to spread them further back. Assuming standard chep size pallets it would have taken 12 rows, 1 row short of a standard length trailer so spread out nice and even.