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Old 09-16-2014, 12:12 AM   #31
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Originally Posted by Airdale View Post
The only acceptable load capacity description for Special Trailer (ST) trailer tires and Light Truck (LT) tires is the lettered load range. However, load ranges across those two designed tires are not compatible with each other. Here is an example; the LT235/85R16E has a load capacity of 3042# at 80 psi. The ST235/85R16E has a load capacity of 3640# at 80 psi. The internal construction materials allows the ST to carry more weight than the LT.

Airdale
Actually the Marathons are at a lower rating of 3420#.
The 378# difference would be completely irrelevant on a 5er with axles that are rated at 6000#s. Either tire overrates the axles. (3042 x 2= 6084)

LT's in the appropriate load range for the # axles is the way to go. Zero blowouts or concerns. I've been running them on trailers for 19 years. All the commercial flatbed goosenecks I've seen are running LTs too, and they're hauling alot more weight for alot more miles. If LT's hold up on the steer axle of my 4x4 crew cab diesel dually (heavy) they of course will handle the trailer axle weight.

Forest River is wise to this and are now equipping the Cedar Creek and others with LTs.
http://www.forestriverinc.com/FifthW...?page=features
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Old 09-16-2014, 06:49 AM   #32
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Could FR finally be responding to all the bent axles and tire blow outs? Hmmmm....
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Old 09-16-2014, 10:03 PM   #33
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As an aside here, I need to clarify something, so please correct me if I'm wrong. From what I can find online (which I know, isn't always gospel,) it seems that a tire's "load range" is just an indicator of the number of plys in the tire's construction, while the "load rating index" actually tells you how much weight a tire can carry. Does this sound right? And why do some tires have one but not the other? They sure don't make it easy to compare apples to apples, do they?
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Old 09-17-2014, 03:30 PM   #34
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Originally Posted by Taranwanderer View Post
As an aside here, I need to clarify something, so please correct me if I'm wrong. From what I can find online (which I know, isn't always gospel,) it seems that a tire's "load range" is just an indicator of the number of plys in the tire's construction, while the "load rating index" actually tells you how much weight a tire can carry. Does this sound right? And why do some tires have one but not the other? They sure don't make it easy to compare apples to apples, do they?
Only LT and ST tires use the load range as a formula for figuring a tires load capacity at increments up to and including the maximum load capacity a tire is allowed to carry. Passenger tires use the load index/service description method for determining load capacity.

The charts for ST and LT tires are very similar in the way the load capacities are displayed. But its very important to remember to never use one for the other.

Airdale

p.s. Load range for LT & ST tires both refer to the old ply rating standard; I.ea 10 ply rated tire is a load range E.
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Old 09-17-2014, 06:39 PM   #35
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I always use LT tires on my trailers. I don't do ST china bombs.
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Old 09-17-2014, 11:42 PM   #36
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I'm thinking it's going to have to be Goodyear Marathons. The 235/80R16 size has a load range E, load index of 3420#, and a speed rating Q (which is 100 MPH and will never be reached while I'm driving it!) Plus they're not made in China. The ST tires are better at handling more weight, I still don't see the advantage of using LT tires. But the China bombs gotta go for sure. The factory stocker Westlake tires have decent reviews, but they'll be coming off soon enough...
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Old 09-18-2014, 06:52 AM   #37
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Quote:
Originally Posted by Taranwanderer View Post
I'm thinking it's going to have to be Goodyear Marathons. The 235/80R16 size has a load range E, load index of 3420#, and a speed rating Q (which is 100 MPH and will never be reached while I'm driving it!) Plus they're not made in China.
As far as I can tell, ALL Goodyear Marathons are rated for 65 mph and are made in China now. Has this changed? Almost all tires are made in China. Sigh...
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Old 09-18-2014, 06:55 AM   #38
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As far as I can tell, ALL Goodyear Marathons are rated for 65 mph and are made in China now. Has this changed? Almost all tires are made in China. Sigh...
The Goodyear Marathon tires that were on my 5th wheel were rated at 65 mph, made in China, and blew out(1) with 6K on the tire.
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Old 10-25-2014, 02:31 PM   #39
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I stand corrected: the Marathons are, indeed only rated to 65MPH. So LT tires it's going to be. Now, to get the load range I need, it looks like I'm going to have to jump up from a ST 235-80R16 to a LT 265-75-R16. Does anyone see any issues with this, as long as there's no clearance problems with the inch greater diameter?

The truck wants to run at 72 MPH in the right RPM range, and dropping to 65 kills me on every little hill...
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Old 10-25-2014, 03:21 PM   #40
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Going to a 265 from a 235 will be an increase in width by 30mm. As long as you have the room it shouldn't be a problem.
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