Pressure lbs Recommended by who? The dealer?
Gary is correct. For the most accurate results you must weigh each wheel position then adjust pressures on each axle based on the highest weight reading on that axle.
I wasn't able to do that until I attended an FMCA rally.
With my first coach, a '97 Four Winds Infinity, I drove to a local moving company and drove onto their scales. For less than $20 I got the whole coach weight as well as each axle. I then consulted the Michelin PSI guide and adjusted my air pressures accordingly.
Fulltimers! - Currently in Gainesville, FL - working as Webmaster & Special Projects Manager