I think whatever air pressure you set your vehicle at that feels stable. I have E rated tires on my Outback and always air them cold at 80psi.
The truck tires when I had E's would be aired up to no more than 45-50psi cold.
It worked fine for me and their was NO wiggle or sway, so do what works for you. Obviously your not going to air your BF Goodriches like a P rated tire?
But
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