First how many are aware that you can pull up on any truck scales along the interstates and I have never found one who wasn't more than happy to weigh you?
If you only go by stickers on your coach, what happens if you're overloaded like so many are, before they even leave the driveway?
How many of you that do weigh, only weigh each axle, like I do and if so, how do you know if one side weighs a lot more or will get that way during your travels?
How about when you leave Death Valley CA one morning and go up to Yosemite National park and where do you stop along the way to to air up your tires because of the change in ambient temps. I mean there's snow up there on Tioga Pass in the summer, folks.
Load inflation chart is the only way to go IMO and again, add the 10 - 15psi to take care of these possible variables.