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Old 09-15-2014, 01:13 PM   #15
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Originally Posted by cory_can View Post
Al, your tires have a rating of 115, or 2679lbs/tire or way over 10K pounds. Since the GVWR of your 25' is only 6300lbs what are you possibly needing that much load index for? You must either run them at really low pressure or your trailer is getting a harsh and bumpy ride. If you are having to run them at really low pressure due to ride quality you may be damaging them (they are designed to run at high pressure). Just like under spec tires, you can also over spec a tire.

A 28' FC has a GVWR of 7600lbs, an appropriate 15" P rated tire is 108xl or 2205lbs each or 8820 total. Comfortably over the GVWR. I'm not seeing the issue.
When using LT tires on a trailer the weight rating should be reduced by 10% to offset the softer LT tire sidewalls.
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Old 09-15-2014, 01:13 PM   #16
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"P" tires must be derated by 10% when used on a trailer or a light truck.
The P235/75/15XL 108T have a derated capacity of 1984lbs for use on a trailer.
That is still 7,936lbs of capacity on a dual axle Airstream.
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Old 09-15-2014, 01:14 PM   #17
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I think using P rated tires on the trailer requires to derate them 10% which gives a small margin for some, especially if the trailer load is uneven and it usually is.
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Old 09-15-2014, 01:29 PM   #18
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Originally Posted by Al - K4GLU View Post
When using LT tires on a trailer the weight rating should be reduced by 10% to offset the softer LT tire sidewalls.
10 ply Load Range E LT tires should have stiffer sidewalls than the Load Range C GYMs.
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Old 09-15-2014, 01:39 PM   #19
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Considering Eddie Bauer Wheel Upgrade, but would like opinions.

The P rated tires are "underrated" to safeguard against improper overloading and/or not balancing properly. It's not that they aren't capable of supporting the full load of their index when towing. They still have ~2200lbs of capacity and aren't magically reduced when you strap them on a trailer to tow. To look at it another way, the industry are suggesting going 10% higher on a trailer for a set GVWR than you would have if it wasn't a trailer.
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Old 09-15-2014, 01:54 PM   #20
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Cory, there are 2 tire manufacturer experts who have posted on this subject at length. And the OP is looking at a 30' bunkhouse...not 28'. Not sure, but I believe it is a 10,000 GVWR trailer.
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Old 09-15-2014, 02:00 PM   #21
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Cory, there are 2 tire manufacturer experts who have posted on this subject at length. And the OP is looking at a 30' bunkhouse...not 28'. Not sure, but I believe it is a 10,000 GVWR trailer.

FC bunk is 8800, Classic is 10K.

I was commenting on the use of 16" wheels and LT tires on smaller models, as it came up earlier in the thread....and your comment about the 28 being "too close for comfort".
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Old 09-15-2014, 06:55 PM   #22
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What options are offered?
We opted for:

Full window awnings
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I skipped the solar as I understand I can get a bigger system for less in the aftermarket.
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Old 09-15-2014, 07:07 PM   #23
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Thanks for all the replies.

I agree I'd rather have the $1000 in my pocket, but something about have the factory do it is appealing to me. I know they would match everything properly. Maybe I am just over thinking it, but anyway, the tire talk is over my head. Mostly because I don't have the time to research it all.

To be honest, I see this as a "wish list" item, I am sure the standard equipment is just fine.

Thanks
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Old 09-15-2014, 08:36 PM   #24
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Cory_can,
The 15" GYMs that were standard on my trailer and listed on the placard, when inflated to the recommended 65psi each have 2540# capacity. My 16" Michelins, inflated to 75#, have 2560# capacity. So, if my Michelins are shaking my trailer, I suspect the GYMs would be too. I really don't know why AS seemingly over-specified the tires, but I believe I should keep the same load carrying capacity as originally specified until I know a reason not to.

I have acquired a vibration analyzer app and plan to record the internal vibration at various pressures to see how much difference it makes. But with 500 miles under tow, nothing is falling off the wall yet.
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Old 09-15-2014, 09:03 PM   #25
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Load capacity on tires decrease as heat/speed increase and since ST tires have a low speed rating (due to not being able to dissipate heat) they are over rated. Trailers these days are routinely pulled at speeds up to and exceeding ST limits.

That and it's much cheaper for AS to put the same wheel/tire package on several trailers across the lineup
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Old 09-15-2014, 09:21 PM   #26
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I am in the purchase stage of a new Airstream and was wondering if anyone could help me decide of the EB Wheel Option. It is a $2500 upgrade. The trailer is loaded and my life's dream. I have 2 weeks to decide.

Any thoughts?

Thanks so much for your help.

Ted
Wow !!!!! Based on my buying experience last year $2500 looks like full retail or they have really jacked up the price. I paid $1960 last year for the factory EB 16" wheel and tire upgrade on my 2014 30' FC. You can always upgrade later or try to get a better price.
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Old 09-15-2014, 09:24 PM   #27
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The Marathons are rated for 65 mph. As I understand it they are rated for their load carrying capacity at that speed. The Michelins are rated to 100 mph. Maybe that makes them stronger and therefore ride rougher, but the counter to that is the claim often made on here that the ST tires have stiffer sidewalls to counter the lateral stresses of tandem axle service.

I don't know the complete story, but I'm more than satisfied with my choice. We'll see what a few thousand miles on the road will bring. I'll know that answer in November. I know I'd rather have these than the GYMs, and I'm pretty sure I'd rather have them than the P-metric passenger tires.

But as I said in my original post, just my opinion, YMMV.

Al
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Old 09-15-2014, 11:00 PM   #28
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I also would recommend doing it yourself. I did the special order for my from Airstream and along with being more expensive, the installed a discontinued older Michelin tire. I found this out after having a flat and not being able to get the same tire as a replacement. The older version of the tire was discontinued several months prior to my trailer being built.
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