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Old 02-21-2014, 05:39 PM   #11
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OP has a truck not a motorhome
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Old 02-21-2014, 06:02 PM   #12
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OP has a truck and regardless of what he's planning on towing, he should definitely get rid of the P tires and go to a LT LR D or LR E.

When towing or loaded, go to max pressure per sidewall and when not towing or loaded decrease to approx. 35#-40#
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Old 02-21-2014, 06:07 PM   #13
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OP has a truck and regardless of what he's planning on towing, he should definitely get rid of the P tires and go to a LT LR D or LR E.
that's right. And skip those overcomplicated formulas. The tire manufacturer has already done the research and have recommended pressures to be used.
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Old 02-21-2014, 06:11 PM   #14
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that's right. And skip those overcomplicated formulas. The tire manufacturer has already done the research and have recommended pressures to be used.
X2. Forget the formulas, why re-invent the wheel or in this case the tire. I put a lot more faith in the tire mfgrs data than the posted formulas.
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Old 02-21-2014, 10:10 PM   #15
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Thanks for all your help. Today I bought a set of cooper AT3'S.
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Old 02-21-2014, 10:16 PM   #16
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Thanks for all your help. Today I bought a set of cooper AT3'S.
Just bought a set of those myself in E rated. They sure are a nice tire!
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Old 02-21-2014, 10:19 PM   #17
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Yes I agree. Now if the weather here in pa would just cooperate I would love to try them out with the camper behind for about a week or 3.
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Old 02-22-2014, 10:54 AM   #18
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For A truck you can use my motorhome spreadsheet too.
And because the tires chanche the pressure advices on truck are not valid anymore.
If you then look up the assumed loads in a list of the tires, those lists that can be found in America are giving to high loadcapacity for the pressure.
If you see different loadkinds ( C to H load) in one list you can sertainly say they are wrong. This is not done in Europe and also formula is used that leads to lower loadcapacity for the pressure, so saver.
For P-tires and XL/Extraload/reinforced American TRA swiched over to the European ETRTO formula as late as 2005.

So I dare to write that you can better use my motorhome/smalltruck calculator then looking in American lists, wich still uses for C-load and up formula that leads to to much deflection in the lower load/pressures.
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