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Old 10-29-2013, 08:59 PM   #15
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Freightliner Owners Club
Join Date: Jan 2012
Location: SE Michigan & Central Florida
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Originally Posted by Mr_D View Post
Lots of people (me included) run 5 psi higher. That allows for some leakage without having to fill the tires everytime they drop a few psi.
If you check the charts, adding 5 psi more provides for a fair amount of load fluctuation and protection without causing a firm ride as well as protects against any leakage.

Interestingly, I would have to overload my coach to reach the point of inflating the tires to the maximum psi. A sorry state of affairs for those who inflate their tires to the max without weighing their rig.

2012 Sportscoach Cross Country 385 DS Freightliner XCR w/ Cummins ISB 6.7L 340 hp
2009 Saturn Vue, Blue Ox Alpha, RVi Brake 2
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Old 10-30-2013, 03:25 AM   #16
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I made a "motorhome-tire-pressure-calculator" in wich I use my own formula , wich is beter then that of the tire-makers, and adds first a reserve load for things like , pressure loss in time, unequall loading R/L, incidental extra loading or loadshifting during vacation, and whatever I might have forgotten to mention.
In case only GAWR's are given in part 1 it uses that with rear a reserve for overloading depending on the GVWR of the motorhome.
In case Weighed or assumed Axle loads are given in part 2, it uses those with a reserve of 10% added.
In case in part 3 4 point weighing is given it uses that and makes the weighed loads to be between 85% and 95% of the loadcapacity belonging to the adviced pressure.
All these used reserves are given to make it clear, but can be chanched by you , if you want it different, if you have other idea about it, so you stay boss.
It also gives more additional information wich can be usefull.

In this map on my public map of skydrive, take the newest american version ( so tire instead of tyre) and download it first by RIGHT-CLICKING and choose DOWNLOAD. Then open it in Excell or Open-office CALC on your computer . Dont leftclick or choose other because those are to complicated or cant handle some important things I used in most spreadsheets.

So in lack of weighing ( preferably 4 point) you can now look for the GAWR's ( mostly on same plate as pressure-advices) on car, and the tire-data as maximum load and pressure needed for that from the sidewalls.

If then questions pup-up or you want me to do it, ask me in this topic.

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