I run mine at 28 psi

 

I'm running the Mud Grapplers (35/12.50R17) and while they look awesome, and do well off road, they are loud as crap. I don't DD mine anymore, so tread wear isn't too big a deal. I wouldn't buy them again as the noise is too much for my liking.

Oh, I'm an odd ball on this forum; I run close to 40 psi on the street and around 10 psi on the trail with my Spyderlock wheels.