Tyre pressure ?

Old Tom Joad

I have a Puegeot Boxer Autosleeper camper and need advise on tyre pressures ! The tyres on the van have a maximum tyre pressure of 65 psi. I know you really need to know your laden weight to work out what pressures to run with, but can someone give me an
approximation of what roughly I should be running on fully laden. We don't take the kitchen sink, no bikes, no awning and just two ordinary size people ! Thanks in advance.