Bedlam wrote:
My LRH 16PR 245/70R19.5's see 80 psi up front and 110 psi when loaded. Unloaded, I am at 75 psi front and rear. As posted, get your weights and use the load inflation tables (I inflate 5-10 psi more than I need).
This.
I usually run 80 psi in the front, and 110psi in the back when loaded up.  It's a PITA to get to the 110psi however; my big compressor cuts out at 115psi, and back in at 90psi..  So I bleed the tank down to get it back up to 115psi.  I also have a 
Truck Air Compressorthat supposedly can do that pressure also.  I use that to fill my air bags also.
I figure it reduces the rolling resistance, and I know I do not have to worry about loaded weight so much.