The door stickers in any motor home are close to useless. They are merely recommendations based upon what your rig "might" actually weigh. Replace the original tires and your door sticker becomes less than useless.
The only way to correctly fill your tires is to load (realistically), and go to the local Cat Scale. Take those actual readings and check that particular tire manufacturer's load/inflation tables and air up accordingly. The same size tire from different manufacturers can vary greatly in actual load capability not to mention how it rides and handles.
:C