Here is a link to a UK website with a calculator for suggested motorhome tyre pressures. https://www.tyresafe.org/check-your-pressures/motorhomes/
Also see their technical information guide on tyres https://loadsafe.nz/wp-content/uploads/2020/08/motorhome-tyre-pressures.pdf
Below is an extract from Continental tyre catalogue for Vanco Camper tyres giving suggested tyre pressures versus actual axle weight
A “rule of thumb” as a starting point for tyre pressures is the calculator below
Suggested tyre pressure = (Actual weight on tyre / Tyre rated weight) x Pressure at rated weight
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