The tire pressure label only applied to the original tires that came with the rig. If you're the OP and are still using those tires, they should be replaced...
Assuming that the tires have been changed, get the model and brand off the tires, go to the tire manufacturers web site and look for their tire charts that show weight vs pressure. Weigh your RV, than set the pressure according to the charts.
Meanwhile, just set the pressure at the pressure shown on the tires sidewall. That's the cold pressure for the max weight and won't hurt anything to run them at that until you discover the proper pressures.
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