I think I usually run 80 rear and 65 front on my rando bike with 32mm wide tires. That said, I am doing that on a bike that is not lugging around camping gear. I would run higher on my rear if I had camping gear loaded on back.

Click on City/Trekking and look for your exact tire. And select that.
Tyres

For example on this tire they say it is 70 to 85 psi.
continental bicycle CONTACT II

That said I have seen tires that have different pressures printed on them than a web site. Take another look at the tires, maybe with a flashlight so the raised print stands out higher. It might be listed in bars, not in psi.