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Old 11-19-2013, 06:09 PM   #91
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Thanks Herk, I've checked and we're 5300# dry and under #6500 with DW's closet full and pantry stocked. We travel dry to the destination then fill the fresh tank. I can't remember the tire load max (these are the factory originals) but will check when I get home I'm definitely the "Edge Wear" example. Just the DW and myself so I don't think we're overloaded but worth an easy look. TT is 24' and with double axels I would think pretty well set up. Is it possible the extra weight of the slide over those tires would cause the problem more so on that side?
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Old 11-19-2013, 06:13 PM   #92
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Mike, I am pretty sure this is not true.

Trailer tires (ST) are made specifically to be installed on a trailer. They have lower rolling friction (better gas mileage), stiffer sidewalls (for hard twisting turns), and more lubricants in the rubber (to keep them flexible since they sit more often than they roll).

Passenger tires (P) are the worst possible choice for a trailer as they have the lowest load carrying ability of all tire types. "Light Truck" (LT) tires of the correct load range would be a much better choice if you insist on not using the proper tires on your trailer.

If you have any further questions, feel free to contact:

Walter C. Cannon
Executive Director
RV Safety & Education Foundation
321-453-7673
Fax 321-453-3853
Walter,
You need to "section" and buff each type of tire and form your own opinion. I can tell you from my experience passenger tires have a stronger bead, higher stiffer bead filler, heaver polyester sidewall with higher end count, heaver/wider steel belts with higher end count. The tread compounds contain higher concentrations of carbon black and shed water more efficiently. Passenger tires also have significantly better ride characteristics such as radial forces, lateral forces and conicity forces. Claims of heat buildup are basically a mute issue since the bias tires have been replaced by radial tires. Again, from my experience, and my observations from tire sections, passenger tires are significantly better. I actually suspect that since the quality standards seem to be worse than passenger tires they (trailer tires) are an outlet for poor quality ingredients. One glaring fact remains, a "blow out" in a passenger vehicle is truly life threatening. Whereas a blowout on a trailer is dangerous... it is not as life threatening.

Walter, I believe in my personal experiences. I would seriously appreciate any actual factual opinion otherwise. Section a few tires and tell me what you see.
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Old 11-19-2013, 06:39 PM   #93
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Walter,
You need to "section" and buff each type of tire and form your own opinion. I can tell you from my experience passenger tires have a stronger bead, higher stiffer bead filler, heaver polyester sidewall with higher end count, heaver/wider steel belts with higher end count. The tread compounds contain higher concentrations of carbon black and shed water more efficiently. Passenger tires also have significantly better ride characteristics such as radial forces, lateral forces and conicity forces. Claims of heat buildup are basically a mute issue since the bias tires have been replaced by radial tires. Again, from my experience, and my observations from tire sections, passenger tires are significantly better. I actually suspect that since the quality standards seem to be worse than passenger tires they (trailer tires) are an outlet for poor quality ingredients. One glaring fact remains, a "blow out" in a passenger vehicle is truly life threatening. Whereas a blowout on a trailer is dangerous... it is not as life threatening.

Walter, I believe in my personal experiences. I would seriously appreciate any actual factual opinion otherwise. Section a few tires and tell me what you see.

I am not Walter.

Walter is an RV safety engineer at the Center for RV safety and Education.
If you won't buy advice from a real expert; then you certainly don't want to hear anything "I" would have to say.
Herk
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Old 11-19-2013, 06:50 PM   #94
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Originally Posted by Canonman View Post
Thanks Herk, I've checked and we're 5300# dry and under #6500 with DW's closet full and pantry stocked. We travel dry to the destination then fill the fresh tank. I can't remember the tire load max (these are the factory originals) but will check when I get home I'm definitely the "Edge Wear" example. Just the DW and myself so I don't think we're overloaded but worth an easy look. TT is 24' and with double axels I would think pretty well set up. Is it possible the extra weight of the slide over those tires would cause the problem more so on that side?
Certainly!

In fact the wear patterns on my 5th wheel are pretty interesting.

I have been inflating all 4 tires to the same air pressure. However, I just got back from an 8,000 mile cross country trip and due to the angle of my 5th wheel when connected, the leading axle's tires are showing slightly OVER inflated wear while the trailing axle's tires are showing slightly UNDER inflated wear.

This spring I will be weighing each axle individually and setting the pressures by axle and not by the aggregate trailer weight (both axles summed together on the scale pad).
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Old 11-19-2013, 07:02 PM   #95
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Thanks Herk, really good to get some real world advice. So it's check your tires load range against the TT loaded weight. Rotate front to back and side to side then do the hokey-pokey and when you buy new, buy the right load range ST and GO Camping!
That about it?
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Old 11-19-2013, 08:33 PM   #96
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Thanks Herk, really good to get some real world advice. So it's check your tires load range against the TT loaded weight. Rotate front to back and side to side then do the hokey-pokey and when you buy new, buy the right load range ST and GO Camping!
That about it?
Pretty much. When these Marathons are done (maybe 2 more years); another set of Marathons will go right on. I will try to get another 4 from the Gadsden Alabama plant again (code MD), but I would have no problem buying Goodyear from any plant (even the dreaded Chinese plants).

I went UP one load range (C to D) when I bought the Marathons and will be replacing them with load range D again. There is absolutely NO reason (IMO) to go up more than one. Truly a waste of money. I like the ability to run a higher pressure than needed (up to 10 PSI) in case I need to run at higher than 65 mph for safety reasons (like heavy, high speed traffic). Not saying I will; just that I can.

See the attached tech bulletin from Goodyear for speed rating information on Marathons.
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Old 11-20-2013, 02:12 AM   #97
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Tireman has written about weighing each tire individually. Sometimes the front axle has significantly different loading.
After reading a thread about a fiver that was 1,000 lbs. heavier on the driver side, I think that would be the only way to go.
An LT tire is the only option to an ST, but you have to reduce the load capacity by 10% if using it as a trailer tire.
A pressure monitoring system would be a good idea, too.
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Old 11-20-2013, 05:25 AM   #98
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Tireman has written about weighing each tire individually. Sometimes the front axle has significantly different loading.
After reading a thread about a fiver that was 1,000 lbs. heavier on the driver side, I think that would be the only way to go.
An LT tire is the only option to an ST, but you have to reduce the load capacity by 10% if using it as a trailer tire.
A pressure monitoring system would be a good idea, too.
Also very good advice...
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Old 11-20-2013, 07:21 AM   #99
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I will not get into my credentials other than saying I personally have nearly 50 years of experience with tires... from development, manufacturing, testing and using.

There is a lot of miss information and sales hype regarding trailer tires. In my personal opinion, they are significantly inferior to equivalent passenger tires.

A case in point, the rear of a front wheel drive vehicle is nothing more than a trailer. Those tires will see the same forces, wear and stress as those on a trailer. Why is it those passenger tires outlast trailer tires by tens of thousands of miles?

Passenger tires are produced to a better standard.

If you doubt it, cut sections of both tires and compare for yourself.
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Old 11-20-2013, 09:04 AM   #100
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Originally Posted by Mike Bullard View Post
I will not get into my credentials other than saying I personally have nearly 50 years of experience with tires... from development, manufacturing, testing and using.

There is a lot of miss information and sales hype regarding trailer tires. In my personal opinion, they are significantly inferior to equivalent passenger tires.

A case in point, the rear of a front wheel drive vehicle is nothing more than a trailer. Those tires will see the same forces, wear and stress as those on a trailer. Why is it those passenger tires outlast trailer tires by tens of thousands of miles?

Passenger tires are produced to a better standard.

If you doubt it, cut sections of both tires and compare for yourself.
Mike,

Do you still work for Continental Tire? I looked at their web page and they not only do not make an ST tire; they don't even make a true LT tire.

The closest tire with an actual load rating is for an SUV and they stress TRACTION not load carrying capability.

Continental USA Car / Light Truck / SUV -*CrossContact
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