I run my 17.5 Sailun tires at 115psi, although rated for 125psi. When I bought them, Ron suggested 115psi and they are wearing evenly. Tire manufacturers have a table listing optimal pressure for the load. Look for one on the net or ask your dealer.
Elliott & Vicky, and Sadie the GSD copilot
2014 36RE, Onan, Titan disc brakes, 17.5 inch Sailun H tires, lots of other options
2013 RAM 3500 CC, LB, DRW, Cummins, AISIN, 4x4