Tire inflation pressure depends entirely, for the most part anyway, on the weight each tire is carrying. You can't go by vehicle mfg spec unless you are using the OEM tires, which I'm guessing most of us don't, once it comes time to get new tires.
The only tire mfg spec I've seen on tires is max pressure, which generally is for when the tire has the mas load on it. I've never seen a weight chart from a tire mfg that says for 'y' weight use 'x' pressure. But to use such a chart, if you had one, would require you to weight each corner. Chalk is easier.
The only reliable way to know you have the correct pressure is the footprint test as shown here, and as I mentioned in another similar thread the other day.
Under-inflation and over-inflation are both safety hazards.
Four wheel drive allows you to get stuck
in places even more inaccessible.
62 88 reg
67 NADA x2
74 Lightweight - The Antichrist (tag 6A666)
95 D1 - R380
95 D90 - R380
97 D1 - ZF