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what kind of truck?

If it is a 1500 series truck I would say 40-45 psi would be ok.
 

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The 80psi that it says is the maximum manufacturer recommended pressure for that tire, being that it's a Load Range E. If you have a 1500 don't run 80. I've been running 40 on my 35s for two years with no issues. I would say between 35-40 on that size, pending the truck.
 

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41.0954874654654984lbs
 

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ΜΟΛΩΝ ΛΑΒΕ
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I know this thread is old, but since it was resurrected, for future reference, this is a Tire Load Inflation Table from Toyo, but it applies to all brands of tires, (you can get the same information from the DOT, this was just easier to find).

http://toyotires.com/sites/default/files/page-files/LoadInflation_Table_P-LT_102913.pdf

Find your size tire, figure out your weights front and rear, add a little fluff, and run that.

But looking at your size, assuming 1/2 ton I would probably run 50 front, 45 rear, 3/4 or 1 ton 60 front 55 rear, of course bump it up for running a load.

Otherwise, given the lack of information, just pump them all up to 80 and roll.
 
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