Tire Pressure Q

Setting the pressure at "cold" temperature makes sense to me but, do I need to compensate any in AZ when "cold" tire temps can be 80 to 90 degrees? I usually set mine about 5 psi less than recommended and still see highway temps of 100 to 110 degrees.

First, you should probably start out with your rear tires at the max 80 psi. That is measured with a cold tire, meaning the truck has been sitting in the shade for at least a few hours. You can drop down the front tire pressure to about 70 psi to improve the ride, but the camper weight is all on the rear tires and you need full pressure to achieve the maximum load capability. Under inflated tires will run hot, build excessive pressure and are prone to failure.

Next, expect the tire pressure to increase substantially under load especially at high speed on a hot day. If you start at 80 psi, you could easily see the pressure rise to about 90-95 psi. This is the way the tires are designed to operate and never reduce the pressure because it has built up during use. Again, the pressure should only be set with the tires cold. Even a few miles heading the gas station can throw off the setting.

WNYBob wrote:
For carrying a TC you might want to go up in tires and get load rated D or E. They have stiffer sidewalls, therefore less flex and less heat.

80PSI is E. Might want to go up to F, G, or H... depending on what it is.

For carrying a TC you might want to go up in tires and get load rated D or E. They have stiffer sidewalls, therefore less flex and less heat.

Basic procedure..fill tires to desired pressure cold.

The door label display universal values, what not always work with TC.
For perfect inflation, go to the scales and get your axles weight, than having the load go to tire manufacturer site for inflation chart.
High pressure raise after driving indicate lot of moisture in the tires, or lot of heat due to tire overload, but 5 psi raise is nothing to worry about.

Those are cold inflation pressures, they are going to go higher as the tires warm up. Perfectly normal.

Set the tire pressure cold. Yes they will go up as they warm up but that is OK.