275/40ZR20 tyre pressures in T6.1 2800

Hi everyone.
Apologies if this has been mentioned before but what are the tyre pressures for the above tyre sizes and weight of van. They are currently at 38 psi. Another thread did indicate that these types were also not suitable as they are considered too big?
I've had the Campervan about 6 weeks now. Just want to make sure that ;
1. The tyre sizes are ok
2. That the tyre pressures are ok at 38psi
Thank you in advance.
 
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