I run 47 lbs on 10 ply 285/75r16s.

 

20 lbs of pressure in most tires at highway speeds is a recipe for disaster... There are two things you can do. The first, which takes a bit of time, is to measure your tire pressure cold. Run the truck at speed long enough to get the temps up and see how much the pressure changes. Ideal is like 10% increase. So if you are at 20 cold it should be 22 at operating temps.

The second way is to check with your tire mfg and see if they have a chart for pressures which are normally based on weight. It will tell you an optimum pressure (again cold) to set the tire at. Some times you have to dig to find it however or call their customer support line.

Closing thought, this pressure is for operating speeds not for offroad...

 

 

 

it is because that is the max and because the Disco rear hatch area is meant a carrying space for a pretty good amount of weight. In one of the books i have on them somewhere it gives unladen pressures which are much lower in the rear

 

I seldom carry anything in the back so I run 32 front and rear. Rides pretty well at those pressures.

 

Same here with 32 all around.
Unless my mother-in-law is in the backseat then I'll bump up the rear TP to 46.

 

All tires/sizes are different & so are the vehicles they’re installed on. Discount Tire always over inflates my tires. I prefer to come home & do a chalk test. Start aired up & go back n forth over the chalk until all of the tread is covered by the chalk = tires are aired up properly per your application. Once you do it, you can keep a record of the Front/Rear PSI & then quickly air them up in the future.

Learned that back in my Jeep days as everyones idea of proper PSI was never correct due to equipment/tires. Chalk test will without a doubt get you to the proper PSI.