It's all about the type of tyre. As well as the size you need to know the load index or maximum pressure. That will be shown on the wall of the tyre.
You can then do the maths yourself or there are plenty of caravan tyre pressue calculators on the internet.
Pressure calculator https://www.tyresafe.org/caravan-tyre-pressure/
You need to enter max weight of caravan should be on plate on caravan & tyre size & load index which you can read off tyre sidewall
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