Motorhome manufacturers recommend tire pressure based on gross vehicle and axle weight ratings of the chassis. If you have accurate individual wheel weights with the motorhome fully loaded (liquids, people, supplies), then you can compare those numbers with the loading charts provided by the tire manufacturers.
Be a little leery of individual wheel weights established at a public scale. If the ground surrounding the scale isn't perfectly level, you may not have accurate numbers. That could lead to underinflation if the numbers are wrong. Before using loading charts to establish pressure values for your tires, verify the weights using an individual wheel scale.
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