65 psi front and rear is likely what the door sticker specified for your dually. I have a '97 F350 dually diesel 4wd with nearly the same GVWR (11,000), RGAWR (8250), FGAWR (5000) and same size tires and wheels (235/85-16E, on 6" wheels with 5.35" offset). My door sticker says 65 psi front and rear. My wheels also have a pressure limit of 65 psi, as spec'd by the wheel manufacturer, Accuride.
My wheels also have a pressure limit of 65 psi, as spec'd by the wheel manufacturer, Accuride.
Really? Are those OEM's or aftermarket?
80 PSI on a E rated 235 dually tire (which I thought the OP had) would support over 12k lbs of weight. Just a little over kill for our pin numbers, IMO.
Those are the factory stock wheels for my cab/chassis F350DRW 4wd with 8250 RGAWR and 235/85-16E's.
The F350DRW pickups and 2wd DRW cab/chassis of the same era had different wheels (5.00" offset instead of 5.35"), but they also had 65 psi rating, with 7400 RGAWR and came with smaller 215/85-16E tires.
The F-Superduty DRW cab/chassis of the same era had 80 psi wheels and 11,000 RGAWR, with 10-lug hubs and 235's.
My F350SRW of the same era came with 80 psi single wheels, 6084 RGAWR and 235's.
235/85-16E's in a dual application have 2775 lb weight rating x 4 = 11,100 lbs.