I always set the tire pressure to what the vehicle recommends.For my truck and car I use the
recommended pressure stated on the door frame drivers side.For the RV I use the recommended
pressure stated on the sticker located usually on the left front panel.
The only way these values would differ is if different replacement tires were installed.
All I can say is, remember the fiasco that Ford and Firestone had?? Firestone said 36 psi, Ford didn't like the ride so they said 28 psi. Remember what happened?? I would go with the tire manufacturer any day, every day. The manufactures have the engineers that designed and had them built, subsequently they are the experts, not the car, truck, or trailer manufacture.
I made a mistake saying use the vehicle recommended tire pressure.On my dually the door tag recommends 65 psi on both front and rear tires.
It was the spare that they recommend have 80 psi.I always run 80 psi in the rear
loaded and unloaded.