According to the sidewall of my Cokers, the max load is 1520 lbs at 41psi. Not sure if 41 psi is the recommended pressure, but I try to keep mine around there. The '47 has pretty soft suspension, so don't experience any harshness in the ride.
I remember Ford's problems with the Explorers and the roll-overs!!
Ralph, your Sask., "ride comfort measuring device" and my AZ one, have gotten more sensitive with wear!!! That's my story and I'm sticking to it!!