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Old 10-30-2015, 10:59 AM   #51
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I am one of those who has had an early failure of a tire on a brand new trailer.

In the end, the issue I have is whether my tires are safe.
By 'safe' I mean are they used within the manufacturer's specs and have they been tested to show that those specs are met.

The evidence I see is that, in the case of my trailer, the tires are stressed beyond their ratings when the trailer is used in an otherwise reasonable way...towing at the advisory limit on a curve.


In the end, I'm either right or wrong about this.
The NHTSA engineer who now has my math will ultimately be the judge of this....
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Old 10-30-2015, 11:24 AM   #52
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For anyone who might be interested, you can check out how the advisory speed limit for curves is determined in section 3.6 of the document at this link:


Procedures For Setting Advisory Speeds On Curves - Safety | Federal Highway Administration
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Old 10-30-2015, 11:38 AM   #53
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It's not only the tires to be concerned with, but also the marginal rating of the axles.

Here is what I did to buy peace of mind.

Rockwood 8315SS Axle Upgrade

I now have over 25,000 miles towing since the upgrade. I consider it the best money ever spent on a travel trailer. At 25,000 miles, the tires show only minimal wear.


John U
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Old 10-30-2015, 11:52 AM   #54
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Originally Posted by midnightpumpkin View Post
It's not only the tires to be concerned with, but also the marginal rating of the axles.
Yeah. I've been worried about that too. Having a spindle break off due to overload would not be a whole lot of fun.

Axles are a little different in that when load shifts to the outside wheel, the total weight on the axle stays about the same. It's harder to point at a violation of manufacturer specs on the axle.

I asked Dexter about overloading one end of an axle and was told it's fine.
For me, this raises an alarm bell because I wasn't told a spec for how much overload one end of an axle can take. So this is reassuring hand waving and not a real engineering answer.

However, I can only slay one windmill at a time. Tires are the biggie for me since I've had a tire fail without obvious cause.
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Old 10-30-2015, 12:02 PM   #55
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You will know if there is an issue with the axles after about 6-8 thousand miles of towing. In my case, there was excessive wear on the inside edges of the tires.

John U
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Old 10-30-2015, 09:59 PM   #56
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Ha, I suppose that would be like trying to find a "friendly" letter from the IRS that you look forward to getting?

I understood the request to mean he would like to see an example of what NHTSA would find a useful.

I will try and provide an example in the next day or so. I do have several forums I follow as well as my blog to write. Believe it or not I actually have things to do other than post here
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Old 10-30-2015, 10:28 PM   #57
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Can you show an example of a good NHTSA report?
This would depend of which side of the fence you are on.
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Old 10-30-2015, 10:30 PM   #58
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Originally Posted by Tireman9 View Post
I understood the request to mean he would like to see an example of what NHTSA would find a useful.

I will try and provide an example in the next day or so. I do have several forums I follow as well as my blog to write. Believe it or not I actually have things to do other than post here

Correct. Specially #3 and #6- what constitutes quality/full information for the NHTSA?
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Old 10-31-2015, 02:16 AM   #59
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I'm thinking that maybe it doesn't work and the industry has been trying to ignore it.
Au contraire, your TT model is very popular and FR has sold bags of them over the past five years - all with 14-inch wheels & tires. The 2016 models come with... 14-inch tires.
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Old 10-31-2015, 07:09 AM   #60
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Another thought, just to add to the mess here. Suppose I have ST205/R14 LR C's on my trailer now, mounted on aluminum wheels. If I go to a LR D, which will carry a higher pressure, will I be exceeding the rated pressure for those wheels? What if I have steel wheels? I haven't seen that mentioned here yet.
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