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Old 05-23-2015, 08:16 AM   #11
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Subtract tongue weight from GVWR and divide by 4. I think he is closer to 2725 real weight per tire.

12700-1800/4=2725
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Old 05-23-2015, 09:12 AM   #12
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Again Jmoo is on it. 12700# is my gross. It's a 5th and I have 3020#on the pin. The math puts me roughly 2420#/ tire.
If Namu is correct about the single/double axle numbers I'm under but close.
Namu can you point me to the chart you are referencing?
Maybe TM is over-optimistic with their load #'s. Or maybe my tires were Monday or Friday builds.
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Old 05-23-2015, 09:25 AM   #13
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78% of capacity. That's a good place to be.

I think you use the double axel rating. (You have two axels and 4 tires )
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Old 05-23-2015, 01:07 PM   #14
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Originally Posted by RedHorse1 View Post
Again Jmoo is on it. 12700# is my gross. It's a 5th and I have 3020#on the pin. The math puts me roughly 2420#/ tire.
If Namu is correct about the single/double axle numbers I'm under but close.
Namu can you point me to the chart you are referencing?
Maybe TM is over-optimistic with their load #'s. Or maybe my tires were Monday or Friday builds.
Here is the page link with the chart on it.

Towmax STR Tires | Own The Road
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Old 05-25-2015, 05:50 PM   #15
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Red horse, the 3520 weight limit is for single axle applications if I am reading the chart right. The double axle weight limit per tire is 3080 pounds per tire which would put you just over the max or at least right at it. Someone can chime in if I am reading the chart right. I don't understand why the limit per tire would be less on a dual axle than a single. Some of you smart ones can explain the difference.
I to would like to know my it was less.
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Old 05-25-2015, 07:34 PM   #16
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The double rating is for two tires on the same side of a single axle. If you don't have a dually the rating does not apply.
I have seen rv's with a dually axle.
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Old 05-26-2015, 12:55 PM   #17
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Hey Norty, that means I can carry more weight then. I am well under the specs. Just weighed my unit today on the scales after I had my Blomax tires pulled and inspected and rotated. Showing more wear on the front tires so switched back to front. Still have plenty of tread and tires were manufactured 28th week of 2013. So I'm still trusting to luck I guess. Pulling with a 2017 Ram 2500 5.9L Diesel
Total truck and trailer 19,300
trailer axles only 9,24o
rear tandems 4520
left duals trailer 4860
right duals trailer 4380
Looks like 500 pounds differnce from left side duals to right side duals. That is the side carry the heavy couch, kitchen area etc versus the other side with the dinette and 2 recliners. Still puts me well under.
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Old 05-29-2015, 10:50 AM   #18
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I was doing some work on the 5th this afternoon at the storage. A young guy arrives and is hooking up(Memorial Day trip). He was at it a while and I saw tools in action. I wander over to ask if he needs something I might have. His prob is the electric tongue jack. He's just gotten it working and we chat. Owned his prev owned TT about a yearand I see it's an older Forrest River. I told him about my recent tire troubles. Taking a look at his I see they're the TowMax, a closer look and they have xx10 build dates. 5 yrs! They are 14" and he's prolly in the 4000# range. Based on what a service tech pointed out to me, one of his looked questionable to my inexperienced eyes.
That was, looking across the tread the tire was domed or arched. The center treads were raised compared to the shoulder treads and that's what you see when the plys start to separate.
So this lends argument to the thought that it's the larger tires and heavier rigs are the problem areas.
An update on this post:
I visited the 5th yesterday to drop off some stuff and found a note that the guy above left me. Seems that the tire in question failed on his Memorial day trip. Fortunate for him it was right in front of a Discount Tire shop and he was on the road within an hour. I noted that as the tire disintegrated it did some cosmetic damage.
My take-away from this is there may be something to the tread "doming" that I described above.
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Old 05-29-2015, 12:58 PM   #19
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Please don't confuse double axle with dual tires.
Dual tires means 2 tires on one side of a axle. Which doesn't count for TT's and 5ers.
As for the Towmax it seems the higher failure rate is in the higher class TT's and 5ers.
Weight and higher outside temps seems helping those failures
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