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Old 03-17-2016, 03:21 PM   #11
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Originally Posted by OldCoot View Post
Better to know the wt of the trailer loaded and that your tires will carry the load and just inflate to what is listed as Max Cold Pressure on the side of the tire and forget it. Use a TST TPMS and go camping.

I wholeheartedly agree.

I will say- if you're running heavy, getting individual wheel weights can be important. Each tire point doesn't carry the same load (even on the same side or on the same axle). It's easy to be unknowingly overloading a tire.
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Old 03-17-2016, 06:32 PM   #12
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Originally Posted by ependydad View Post
I wholeheartedly agree.

I will say- if you're running heavy, getting individual wheel weights can be important. Each tire point doesn't carry the same load (even on the same side or on the same axle). It's easy to be unknowingly overloading a tire.
Over 95% of OE tires are already set at maximum sidewall pressures by the vehicle manufacturer. There is no place to go with tire pressure manipulations.

Individual tire loads can be individually overloaded without the vehicle being overloaded.

To counter those conditions with trailer tires already set at maximum sidewall pressures the RMA recommends a trip to the scales where the owner can weigh and then balance the loads across all tire positions, thus, eliminating the overloading condition (s). Overloaded trailers will have to have some weight removed to be properly balanced.


This RMA reference has four very informative chapters. Chapter 4 starts on page 48 and is all about RV tires.

http://www.mcgeecompany.com/wp-conte...ete-manual.pdf
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Old 03-17-2016, 09:55 PM   #13
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That's some good info Airdale, thanks for post the pdf.

Has anyone seen a tire mfg state the temperature at which they call the cold temp?
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Old 03-18-2016, 03:05 PM   #14
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That's some good info Airdale, thanks for post the pdf.

Has anyone seen a tire mfg state the temperature at which they call the cold temp?
Cold temp is ambient temperature. It means the tire has to cool from its rolling temperature for hours - I like to allow 8 hours minimum out of the sun (overnight). Or I add 3lbs to the pressure I put in the tire if I'm doing it while the tires are hot.

It's at best an approximate science. 40 PSI on my tires in Denver turns into 35 PSI on my tires in Lincoln, Nebraska at the same temp.

Likewise, placard pressure in my tires on a 75 degree day will trip the TPMS if the next early AM is down to 10 degrees. Rule of thumb in Colorado upon seeing a TPMS light is to assume you do NOT have a problem unless there is visual/audio evidence the tire is going flat. At first opportunity, fill the tire(s) to normal pressure and continue to observe.

I try to set my camper tires to sidewall max pressure with normal conditions. If temps are going to be significantly lower, or I am going to the lowlands, I will add another 3#. If going to higher altitude or temps are going up, I just let it ride for a slight over pressure.

As somebody else said, you don't need to overthink this. Air to sidewall max pressure, call it good, and go camping.

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