The yellow sticker... Does it say max psi or recommended PSI? The stickers I have seen show the recommended PSI and are based on the max axle weights for the tires on the mh when it left the factory. The only max PSI I remember seeing is on the sidewall of the tire. If you know the weights of your MH then look up the recommended PSI from the tire manufacturer, which I suspect is about the same as what Fleetwood recommends.
I don't carry a lot of stuff other than the DW's shoes and clothes, but that's a different story. I use what's on the sticker from Thor which matches what I get when I check the Michelin numbers.