Here's my beef with those door stickers and recommended pressures. In passenger vehicles in particular; they build them with 1" - 3" of total suspension travel and they ride like chuck wagons and then try and get the rest of the suspension travel / ride comfort out of the tires by putting 32 lbs of air in them. So the weather changes and your crossing death valley in the summer time and your tires are at 25 lbs. Maybe you'll make it across. If the tires max out at 60 psi; I'd feel a lot better with 60 in them.
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So an RV maker buys one of these:
The sticker on it says pump them up to 70psi. They get done building it and now it weighs 30,000 lbs or more. Your driving across death valley and you've got 60 psi in your tires. Same story. Should have had 90 psi or more in them.
Semi Trucks don't mess around with trying to run the least amount of air for a smooth ride. If the tire will take 110 psi; that's what's in it.
I think the entire RV industry as a whole would have far fewer blowouts and tire issues if all tires were set at max PSI. Safety margin, less flexing at speed. If you read the fine print in the pdfs for semi truck tires; there is a statement that says something to the extent of if you will be running at speed at max load; run an extra 10psi in the tire.
Too many questions/concerns about how much air. All the way and that's the best that can be done. If they are pumped up all the way; what more can you do? At least they aren't under inflated.
