I run mine at 45psi, shop put 30something in them but didn't like the ride of them so I just kept messing with them until I was happy. So far its working great with over 10k miles and hardly any wear.

 

^^^^ Agree
I ran that same tire and size . 45 psi felt really dialed in for my truck.
295/70/18 Nitto Trail Grapplers with 2 Inch R.C. Level kit

 

Short answer: I'm currently running mine at 45psi as well.

Long answer: I also had the same question recently because tire shops usually don't put the recommended tire pressure for the tires, only for the vehicle. That's usually 30-40psi in my experience. If you check the side wall of the Trail Grappler, the max is 80psi, but that's if you want the maximum towing capacity out of the tires. You wouldn't want to run that if you weren't towing a heavy trailer.

From what I've read on here, and other forums relating to these tires, everyone just plays with the pressure until they get a ride that suits their taste. I've seen 45, 50, 55, F55/R50, etc.. Mine were at 33-35 when I got the truck and they had supposedly just been rotated by someone (who failed to recalibrate the TPMS locations). They're now at 45psi but now my problem is that the TPMS are calibrated for the recommended psi from the factory. So now it constantly says check tire pressure for all four corners. Guess I'll deal with that until I can get the dealer to reset that, if they'll even do such a thing. I doubt I go back with these tire when it's time to replace them though. They're too noisy for my DD, rarely taken off road, grocery-getter.

 

I appreciate the responses! I'll have to mess with the settings tonight when I get home. Maybe take it up another 10 PSI on each tire and see how it rides. I didn't even think about getting an error code for higher PSI though, so we'll see how the computer responds to that

 

I'm running mine at 50psi