geolandars installed...look great!....with the 285/60/18's...trimmed less than an inch wedge from passenger side cladding, was not rubbing on drivers side , but was so close, trimmed 1/2 wedge, JIC

been searching for tire pressure used in theses larger tires...no mention of these geolandars but the nittos seemed to run 38, 40 and 45 from threads I have seen

...tire installer said 32 lbs, tire rack said use manufactures # EVEN with any larger tires. installer logic was taller side wall would flex more , but after thinking a bit , seems since i stayed with 60 series..still same ratio of sidewall?
feel tireracks answer is from their lawyers, not tire experts...Any 285/60/18 geolandars and others willing to chime in?