The yellow one from Rev/HR is what you use until you have a scaled weight to justify anything different. The white Ford label describes the psi used to determine the max axle ratings shown on that placard and determined that before the motorhome body was installed. You could use that psi, but you would be inflated more than Rev has determined is necessary for the vehicle GVWR. Under federal law, it is the final manufacturer's (Rev's) responsibility to make the vehicle tire psi recommendation.
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL