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I've read in off roading magazines that your section width (usually a little wider than the tread width) should not be more than 4" wider than the wheel width. That said, sites like TireRack.com have the manufacturer's recommended wheel width range.
As far as tire pressure, I usually go a few pounds less than the MAX pressure listed on the tire. It's a bit rougher ride, but should result in less sidewall flex and better MPG. The recommended pressure listed on the vehicle itself (usually in the door jamb) is usually pretty low; I'm assuming that's to allow for a smoother ride. Plus, my stock tires had a 44 MAX psi rating. I've forgotten what the door jamb says, but I would think it would be related to that 44 psi MAX versus the 35 psi MAX on my replacement tires. So, that's another reason I would think it'd be good to stick with the pressure listed on the tire.
I'd think you could find some good advice for trail tire pressure in the 4x4 section. I thought you typically ran normal tire pressure off road unless you were in the rocks or the sand (in which case I believe you need to "air down").
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Jerry
2004 Frontier, King Cab, XE, 4x1, 4-cyl, 5-spd
My Frontier Page
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