I look at it this way,.....if thats the maximum load carrying capacity of that tyre, and 3.5 bar is the specified pressure for operating at that load, then there is no need to ever exceed that pressure, so its effectively the MAX pressure.
As to what YOUR inflation pressure should be then you would have to either check with the tyre manufacturer or trailer manufacturer and know the actual load on the tyre.
Until you find out I would inflate to near or to the maximum, as underinflation is far more likely to cause tyre damage and heating than overinflation. (lorry tyres are effectively overinflated when running empty!)
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