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Vehicle manufacturers set recommended tire inflation pressures for all Original Equipment (OE) tires. By regulations they are the only ones responsible for that action.
The recommended tire inflation pressures set by the vehicle manufacturer becomes the minimum standard for all subsequent tire fitments to that vehicle. In other words the load capacity of the OE tires must be maintained because they were established as appropriate for that vehicle. So, if OE tires provided 3420# of load capacity the new recommended tire pressures for G614 replacements must equal or exceed 3420# by inflation. That would be about 96 psi. To get a little extra from the tire I’d go to 100 psi but 96 is the minimum according to the G614 load chart.
There are no provisions anywhere in the regulations or tire industry standards that allow less tire inflation pressures than those established for the OE tires and their replacements. Of course there are situations outside of the normal operating parameters but they are few and unusual.
Setting RV trailer tire inflation pressures to accommodate the load carried is a poor recommendation by whoever makes it. A 1 psi loss of inflation pressure will cause such tires to be overloaded. You can lose a single psi by hitting a curb or pothole or just dropping off the slab you were parked on all weekend. Sure, it’s uncommon but it can happen.
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