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Old 05-11-2012, 09:49 PM   #15
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Originally Posted by FastEagle View Post
The article has been rewritten by a number of people that have put their own twist on it such as adding tire weights and other misleading information.
Yes, that was my point. As to the original article, I tried to find it on the allexperts site but there is just too much ST vs. LT 'noise' to find a specific article with the search tool. If anyone does have a link to the real article I would appreciate it.

Originally Posted by FastEagle View Post
Because Light Truck tires are designed for the riggers of drive and steer axles the term “all position” would have nothing to do with trailer axles.
Like seemingly everything else on this subject definitions are not absolute. Sometimes 'all position' refers to being appropriate for drive or steer axles and sometimes it is used to denote tires intended for drive, steer, or tag/trailer axles. In fact Michelin states 'All-position tires are typically used on free-rolling axles however they are extremely versatile and can be utilized in all wheel positions.' Pick your definition.

But my point remains. If you go to virtually any tire manufacturer's site and select 'RV tires' as an application you are taken to their commercial/truck site where you are presented with a subset of LT (or ST) tires that are approved for such use. Just because a tire with 'LT' on it works well on a Ford Explorer it doesn't mean it is intended for a 12-14,000 lb. RV. And if you ask the tire manufacturers will tell you the same thing. (That isn't aimed at you FastEagle, just a general comment on all the 'LT tires are always better' threads.) As always the best choice of any piece of equipment depends on many factors and never just one.

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Old 05-12-2012, 12:03 AM   #16
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The DOT also likes to define things they certify. Here is how they have defined LT tires.

“Light truck (LT) tire means a tire designated by its manufacturer as primarily intended for use on lightweight trucks or multipurpose passenger vehicles.” (DOT)

Standard No. 139; New pneumatic radial tires for light vehicles. - Federal Motor Carrier Safety Administration


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Old 05-12-2012, 01:13 AM   #17
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The ST tires are designed to withstand the twisting forces that a trailer exerts on better than an LT tire so you can't just go by the load/speed rating either.
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Old 05-12-2012, 08:37 AM   #18
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Originally Posted by FastEagle View Post
The DOT also likes to define things they certify. Here is how they have defined LT tires.

“Light truck (LT) tire means a tire designated by its manufacturer as primarily intended for use on lightweight trucks or multipurpose passenger vehicles.” (DOT)
I'm not sure I understand... are you saying that the DOT is defining a trailer as a passenger vehicle?

In any event I'm not dismissing manufacturer-approved LT tires for trailer use, for example the Michelin XPS rib is apparantly an excellent choice. I'm only saying that there are additional demands on tires used in heavy trailer service and there is no magic blanket approval for any consumer tire with an 'LT' on it to be used in that application. But it's easy to ask the manufacturer whether they recommend a particular tire model for RV trailer service and I'm not sure why people don't simply do that rather than argue about it in threads.
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Old 05-13-2012, 06:49 AM   #19
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RV Tires No, Truck tires yes.

[Note: this is also posted on another thread about tires}

I'm a newbie but this hit home. My story. Oct 2010 bought my first RV, a 1999 Fleetwood Prowler which had been used 4 times and then sat for 10 years. Took it from Seattle to AZ for the winter. Tires didn't lose any air. Folks told me I was nuts for driving on 11 yr old tires. I researched new trailer tires and read lots of horror stories. Did find one that seemed to not have many complaints. The common thread was they were made in countries which no one could pronounce the names of. I learned what could happen if a blow out occurred. Can take out your whole wheel well and then some. Just before I left I decided to try the RV tires I had found. I pulled my rig into a Goodyear Store who had ordered them for me. Just after they jacked my trailer up to put on the tires, a 5th wheel pulled in. He had just bought new trailer tires at the Goodyear in Flagstaff and one had blown coming down I-17!!! Sure enough his wheel well and then some had been wrecked. I walked into the store and told the manager to forget the trailer tires and put on the best truck tires they had which turned out to be Michelans. I had to go to 16" rims but they got them. I also consoled but thanked the 5th wheel owner for showing me the error of my thinking. A year later I have had no trouble and they haven't even lost any air. Did it cost more. Yes. But I value the safety for my wife, myself and others let alone the peace of mind.
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Old 05-13-2012, 11:30 AM   #20
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FWIW, I have LT 235R85, LR "G" Sailun low boy trailer tires on my 5er. They specifically state " trailer use only".They are speed rated for 75 MPH.

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