Yes, it's an individual decision, but one has to consider the consequences of over inflated tires.
Overinflation reduces the tire's footprint with the ground, thus reducing the traction, braking capacity and handling of the vehicle. Overinflated tires can cause uneven tire wear and the tire will be much more susceptible to impact damage. Overinflation can cause a rough riding coach which can lead to many coach problems such as electrical connections becoming loose and cabinetry joints loosening.
I would never inflate to carry more than the GVWR (Gross Vehicle Weight Rating).
As an example my W24 is rated for 9000 front, 15,500 rear. According to my tire size and brand load & inflation charts this equates to 100# front and 95# rear. I would never add 5 or 10 pounds as a "safety" margin to these pressures.
I suggest RVers obtain a copy of Michelin's tire videos, RV - The Critical Factor and Things RV Owners Should Know. Both free by following the link at the bottom of this page.
or by phoning 800-847-3435