Just run at 40 psi on all fours.
Check the rating on the side wall and make sure you dont go over the max psi.
So if they are only rated at 35 psi you cant go higher than that, if they are rated at 80 psi max then you technically could run at 80 psi, it will ride like a empty hay wagon, but you could do it.

40 psi will give you a decent ride, decent mpg and then when you off road if you need to air down you can.

What Tom was doing I think is trying to give you the best ride for your truck.

 

From my sports car days, a car with oversteer problems could be helped with 5 psi higher pressure on the rear wheels. Then add 3 psi to the rear with a load. The manual says 8 psi (24 front 34 rear).
I was running at 30 front 35 rear on my DI, but I should try higher pressures 35 front 40 rear.
I very seldom drive my LR on a highway so I’m not an expert here. I feel that the DI and other SUV’s have dangerous oversteer problems when you have to swerve to miss something at highway speeds. You can barrel roll this truck. Be very careful with these tire pressures. The manual’s 8 psi difference may be right.

 

Somewhat, but more the best pressure for tire longevity and safety, which you get with the correct contact patch. which depends on the right inflation pressure determined by the tire model, size, load rating and load each tire is carrying.

 

which is what i am looking for.

 

Well, you can guess, which is what it is if you read it here, unless the person has the exact same tire and the same vehicle set up the same way.

Or you can use one of the two methods I identified.

 

I have Cooper Discoverer S/T's, right on the sidewall, they say " X-lbs at 35psi max inflation pressure" I would check you're tire's sidewall before anything.

 

The tire pressure listed on the sidewall is the maximum pressure for the maximum load and is rarely the "normal" inflation pressure, unless your tires are maxed out with the vehicle empty, which isn't very safe.

 

I fully agree with Tom, you have to set your truck up properly for your usage and driving style.
I recently bought my DI with new light weight no-name tires on it. They are 2 ply sidewall passenger tires. The car handles poorly with no sidewall stiffness or protection for off road. But it has a good soft ride for going to get the groceries.
I retired to a remote location and in the last 5 years my AWD Astro van hit a deer at highway speed (this is why I now drive a big SUV) one of, the two ply passenger tires on the Astro had a sideway blew out from carrying heavy loads (needed a 4 ply side wall light truck tire) and my Jeep Cherokee hit black ice in 2WD (the back end came around and we hit the snow bank backwards and rolled on to the roof to toboggan upside down hanging from our seat belts --- need AWD).
For me, I need a good handling full size AWD SUV with a set of light truck 4ply side wall winter tires so if any of the above things happen again I will be here to tell you about it.
Thanks to Tom, I will be asking a lot of questions when I buy the next set of tires.

 

I realize that this is an old thread, but I gotta chime in.

I run the BFG T/A KO tires which are 245/75R16 on my Discovery 1 with a 2" Old Man Emu Medium spring kit lift.

I had been having a hard time with figuring out the correct tire pressure... I have tried the following:

- Front 28 psi Rear 38 psi
- Front 32 psi Rear 42 psi
- Front 35 psi Rear 40 psi

All three of those seemed to make me either too bouncy or too wobbly on the highways and regular roads with speed bumps.

The psi that has worked for me now is 40 psi for both Front and Rear tires at this size, plus these are a 10 ply I believe.

 

96 4.0=6,019 lbs. GVWR

95 3.9=6,019 lbs. GVWR

Both are 4,465 lbs. curb weight