Most would run 285/70x17 for a 33" tyre....I believe you can go a little wider on the stock 7.5" rim, but I personally wouldn't.
As for pressure, everyone likes something a little different.....I run 35PSI on my 255/75x17 OEM Goodyears.....but could probably get a way with less...I should do the chalk test and see how they go.
You chalk a band across the tread, and roll down the street in a straight line.....if the centre of the chalk band rubs off, the pressure is too high, if the sides rub off leaving the centre, the pressure is too low.......its a rough guide.
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