tire pressure - again

It's a 2013 coach with no mods. I understand some road feedback is inherent in the F53 chassis. I get that. But my dealership (could be wrong - don't kill the messenger- that's why I ask you guys) said that 83psi on the sticker at the captian's chair, would be max psi. And yes I looked at it 5 times, it says 83. My other units say 85 but they have Conti's - this has G'years. Anyway, dealer told me lowering it 5 or so would soften with no issues. Again, that's them saying that not me. I come here to ask to see if that's a good idea. If you guys said, yep sure Lower it a few I would be fine with it. But so far the overall response is that I seem to be some kind of cheap idiot and should be given lashes for even considering it. And why haven't I weighed it? I am expecting a torch and pitchfork weilding mob to arrive at my house and claim my keys. I am just telling you what was told to me and looking to you guys for answers. And come on guys, I bet EVERY one of you has run your tires off by a few PSi either intentional or not. It's impossible not to unless you drive in a vacuum or measure it daily. Sure I want to be right and safe but some of the doom and gloom is little overkill.