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Old 10-05-2011, 10:38 PM   #11
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Murray,

I gather the camper was "new to you".

How about this as a scenario:

Perhaps the previous owner did what I did when I replaced my OEM C rated tires (50 PSI max) with upgraded load range D rated tires (65 PSI max). Since the C rated tires were minimally sufficient to carry the rated load, I took the best of the bunch (the OEM spare that was only used to drive the camper about 100 miles home when I blew a tire in DC) and put it back on the spare tire mount. Leaving 4 D rated on the camper and a C rated spare.

THEN, he runs over a nail with the new D rated tire and puts the C rated spare on to get home. Lazy, he does not put the repaired flat on the camper but leaves the C tire on the axle. Then, he decides to sell the camper with the mismatched tires to unsuspecting you.

He may even have used the camper like that for a while before selling it.
Out of balance and mismatched load rating could easily have destroyed that tire. Time to buy a tire identical to the 4 on the camper to use as a spare.
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Old 10-05-2011, 10:40 PM   #12
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I would think you running the tire 15 psi over would cause the tire to wear in the center.
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Old 10-05-2011, 11:29 PM   #13
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Quote:
Originally Posted by papap View Post
I would think you running the tire 15 psi over would cause the tire to wear in the center.
I got the impression that 3 were at 65 and one was at 50.
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Old 10-05-2011, 11:36 PM   #14
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I think I read he had them all inflated to 65 psi
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Old 10-05-2011, 11:38 PM   #15
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YEP. That is what he said. One rated at 50 but all were at 65psi.
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Old 10-05-2011, 11:57 PM   #16
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Quote:
Originally Posted by papap View Post
YEP. That is what he said. One rated at 50 but all were at 65psi.
Yes, that's what the deal was. I looked at one sidewall to determine the pressure, I didn't realize that they were different as they look VERY similar. The spare also still had the sticker on it. Maybe the tire place made a mistake? The previous owner said he'd never had the spare tire cover off. I would have thought overinflation would have worn the middle as well. Maybe over-inflationg the tire caused it to dribble like a ball causing it to beat itself up? Right now they're all the same and the crappy tire is the spare.
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Old 10-06-2011, 01:03 AM   #17
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Hopefully the previously owner is being truthful, there is the possiblilty that this tire mentioned has been cupping for quite some time, and he replaced that tire with a "quick fix" by buying a cheaper tire just to sell the unit. If that's the case, his story of not knowing is just a cover up.

Hope not, but it just might be the case
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Old 10-06-2011, 07:15 AM   #18
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"If it was rated for max inflation of 50psi and they were all at 65psi would that cause cupping?"

Was what he said. The "IF" threw me a curve.
It never occurred to me that that was what he was doing.

There was also a new brake back plate put o the wheel... Why?
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Old 10-06-2011, 09:28 PM   #19
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I bought this unit from a local old guy that was selling it because his wife couldn't climb in it anymore. I don't believe he was hiding anything as he had it priced very reasonably and was up front about everything else. The tires all look to be the same age as the tread wear was even amongst all of them. The backplate was replaced because the brakes had an obnoxious howling sound when going slow. (They still do it) The mechanic told me that a pin had sheared off and the parts were just laying in there. I don't know if doing brake work could affect the tire. I also don't know if overinflating the tire by 15# would cause it. The damage occured from the center of the tread to the inside. The outide looked OK. I'm the kind of person that notices things and I also check the tire pressure before each trip. They were all at 55# or so for the 300 miles I pulled this trailer prior to the 500 mile trip. Between that time I read a sticky note here that indicated that trailer tires should be run at the max pressure. At that point I raised the pressure to 65# not knowing that I had one different tire. The tread looked fine before we left and 500 miles later it is cupped severely. I hope this helps. Basically, how could this tire cupping have been created? I have way more miles to go and am really hoping I can make the loop and get back home without buying 5 tires. I just don't have the times for it right now.

Thanks again
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Old 10-06-2011, 09:31 PM   #20
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Does that tire have weights on the wheel. ??? I tend to agree with jimh....sounds like an out of balance tire.
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