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Old 07-31-2016, 02:13 AM   #15
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The Original Equipment tires fitted to your Motor Home by the vehicle manufacturer MUST comply with all FMVSS regulations.

Just because many of the MH tires are designed for large trucks does not allow the use of the Federal Motor Carrier Safety Administrations regulations to supersede the FMVSS regulations used for initial tire fitments for your MH.

Your MH has a federal certification label. If the label has the following statement on it the tires were fitted in accordance with FMVSS regulations;

“This vehicle conforms to all applicable U.S. federal motor vehicle safety standards in effect on the date of manufacturer above”.

I’m often misunderstood when I write about this subject because of strong misconceptions about authority and who has it. NHTSA clearly gives sole responsibility to the vehicle manufacturer in the selection of original equipment tires and setting the recommended tire inflation pressures for their selections. That information must be shown on the certification label. Because of the seriousness NHTSA places on that information, the tire industry sees it as minimum requirements.

It’s all in the regulations but very time consuming to dig it all out and then lay it out in a time line - so to speak - that is understandable. For MHs, FMVSS 571.120 spells out most of it or references other FMVSS sections that will complete it. There is also a web site you can go to for NHTSA interpretations.
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Old 07-31-2016, 10:49 AM   #16
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All these "industry changes" re tire pressure came about in reaction to the Ford Explorer tire fiasco, where Firestone took substantial blame for Ford's low-ball tire inflation recommendation. The same thing led to a federal requirement for a TPMS on every new passenger vehicle. About the same time, Toyo took a lot of heat over Toyo tire failures on Country Coach motorhomes, even though it was CC that had spec'ed under-sized tires. After that, Toyo refused to recommend any tire for a motorhome, regardless of brand.

With those two experiences in hand, the Tire & Rubber Manufacturers decided to place all future liability on the vehicle manufacturers. Then the RV manufacturer's lawyers quickly figured out that they must "recommend" for a worse case scenario to avoid any possibility of liability. And thus today they both refuse to acknowledge any other psi method or number.
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Old 07-31-2016, 12:39 PM   #17
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Quote:
Originally Posted by Gary RVRoamer View Post
All these "industry changes" re tire pressure came about in reaction to the Ford Explorer tire fiasco, where Firestone took substantial blame for Ford's low-ball tire inflation recommendation. The same thing led to a federal requirement for a TPMS on every new passenger vehicle. About the same time, Toyo took a lot of heat over Toyo tire failures on Country Coach motorhomes, even though it was CC that had spec'ed under-sized tires. After that, Toyo refused to recommend any tire for a motorhome, regardless of brand.

With those two experiences in hand, the Tire & Rubber Manufacturers decided to place all future liability on the vehicle manufacturers. Then the RV manufacturer's lawyers quickly figured out that they must "recommend" for a worse case scenario to avoid any possibility of liability. And thus today they both refuse to acknowledge any other psi method or number.
This is Toyo's current standards which are very close to all other manufacturers that follow/apply tire industry standards.

https://toyotires2-1524598101.netdna...ire_safety.pdf
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