Quote:
Originally Posted by Lenny K
If the trailer is out of warranty how does that effect it?
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What's the warranty got to do with it?
What the invalidation does in this case has to do with tire Designated size and recommended cold inflation pressures.
When going from a ST235/80R16 to a ST235/85R16 its called plus sizing. There is a standard tire industry procedure that will include setting a new recommended cold inflation pressure for the plus sized tires. Also in the procedure there are recommendations to make pen & ink changes in the vehicle owner's manual and apply supplemental tire and inflation stickers adjacent to the factory installed placards. (It's called "protecting the field").
When operating without a recommended cold inflation pressure for your tires you're pi--ing in the wind ever time you air your tires.
In the automotive industry there are lists of acceptable replacement tires by designated size provided to retailers. That is not practiced in the RV trailer industry. Therefore, consumers have been provided with a NHTSA mandated statement in the vehicle owner's manual to seek approval/recommendations for replacement tires from the vehicle manufacturer. When you use unapproved replacement tires you're then operating in an unsafe zone. I assume how unsafe will be determined by authorities investigating your vehicle for safety.