If you check with your tire manufacturers web site, you will find a chart of psi for weight ratings for your tire. This chart will indicate the psi for the load on the tires. This chart for my tires indicated that the max indicated on the door jamb is appropriate when I am towing and that 50psi is fine for front and back when I am not towing (back of the tv empty). I usually go with the chart psi + a safety factor.
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