Your wheels can handle 65 psi .
This has been discussed frequently .
The wheel weight loading is a such higher demand that 65 psi is not even a consideration .
CapriRacer floated the idea recently that even if a wheel was stamped 65 psi that he would consider using a load range E tire at 80 psi because the tire is by far the weakest link .
It is a common misconception that RV wheels have some psi limit .
Only a few aluminum wheels are stamped with a psi limit .
The tire is always the weakest link in the tire / wheel combination .