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Old 09-20-2021, 08:55 PM   #127
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Originally Posted by move on View Post
I refer you to the SAE braking test, the sway test and the understeer test.
Copy/paste that info that only certifies to 60mph

It's your statement.

A truck's rated capacity is certified at speeds no greater than 60 mph.
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Old 09-20-2021, 09:02 PM   #128
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Read the SAE J2807 towing standard. Then we'll talk.
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Old 09-21-2021, 12:30 AM   #129
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In other words: you pulled it out of your tukhus.
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Old 09-21-2021, 06:08 AM   #130
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you should really never tow over roughly 80% of capacity or you will be looking at premature failure in a lot of cases.
Premature failure of what?... the transmission? What are you saying would be the first thing to fail?

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I have owned 3500 and 2500 GM trucks. My 3500 trucks always had 2 more leafs in the rear springs. I think if people don't know what "LIMIT" means, they might be a little short on common sense too. MOMCAT
So you are saying that 2500 series GM trucks need the 2 extra leaves added to be equal to a 3500? (as long as the rear axle is the same)
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Old 09-21-2021, 07:39 AM   #131
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I refer you to the SAE braking test, the sway test and the understeer test.
I'm looking at the parameters for each, and none mention that it certifies only to 60 mph.... The braking test is for 20-0 mph. Sway test is 62.1 MPH. Understeer test didn't specify a speed.

https://fifthwheelst.com/SAE-J2807-Tow-Tests.html

https://www.motortrend.com/how-to/15...-the-standard/
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Old 09-21-2021, 08:02 AM   #132
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Originally Posted by Old-Biscuit View Post
Copy/paste that info that only certifies to 60mph

It's your statement.

A truck's rated capacity is certified at speeds no greater than 60 mph.
Why do you care about the J2807 standard and what it says? It says you fail the towing test if you exceed the GVWR. You claim loading over GVWR is safe but J2807 only test to GVWR.

5.4 GVWR/Rear GAWR and Tongue Weight/Kingpin Weight Considerations
(Eq. 4)
The tow-vehicle shall be able to accommodate appropriate trailer tongue and/or kingpin weight to attain a particular TWR without exceeding Rear GAWR and/or GVWR.

https://fifthwheelst.com/documents/t...ds-2016-02.pdf
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Old 09-21-2021, 08:18 AM   #133
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Evidently....You read what I said. What you wrote.....You said. MOMCAT
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Old 09-21-2021, 08:56 AM   #134
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I'm looking at the parameters for each, and none mention that it certifies only to 60 mph.... The braking test is for 20-0 mph. Sway test is 62.1 MPH. Understeer test didn't specify a speed.

https://fifthwheelst.com/SAE-J2807-Tow-Tests.html

https://www.motortrend.com/how-to/15...-the-standard/

Yes, you're right. 62 mph (100 kph). There is no test in J2807 that takes place above that.



When a manufacturer says his truck can tow 12,000 lbs, he's talking to a farmer of contractor who's towing a load around town. That doesn't mean he can go on the interstate with it. If you go 70 or 80 mph you shouldn't be towing that much load.
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Old 09-21-2021, 09:09 AM   #135
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Yes, you're right. 62 mph (100 kph). There is no test in J2807 that takes place above that.



When a manufacturer says his truck can tow 12,000 lbs, he's talking to a farmer of contractor who's towing a load around town. That doesn't mean he can go on the interstate with it. If you go 70 or 80 mph you shouldn't be towing that much load.
That statement should lead us to a breakdown of states with towing speed limits.
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Old 09-21-2021, 09:23 AM   #136
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Old 09-21-2021, 09:43 AM   #137
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Evidently....You read what I said. What you wrote.....You said. MOMCAT
Exactly... wait, what?
I'm just messin with you... gotta love these weight threads!
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Old 09-21-2021, 09:46 AM   #138
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Yes, you're right. 62 mph (100 kph). There is no test in J2807 that takes place above that.



When a manufacturer says his truck can tow 12,000 lbs, he's talking to a farmer of contractor who's towing a load around town. That doesn't mean he can go on the interstate with it. If you go 70 or 80 mph you shouldn't be towing that much load.
I skimmed through the 29-odd pages of standards. It was a real page-turner. There was one stretch of road on Davis Dam where a speed of 65mph was apparently required. However, I have to ask, aren’t these simply the standards by which a towing capacity is determined?

The protocols seem reasonably thorough, and a vehicle capable of meeting all the standards would seem to be capable of operating on the interstate, as well as other public roads.

I may have missed it, but is there any wording in all those pages that says anything about not operating the vehicle at speeds above 60-65mph? If so, we’d all like to see those words.

Finally, my observations are that the manufacturers are talking to ranchers who tow horse trailers around the country at 75mph.
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Old 09-21-2021, 09:53 AM   #139
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Since you guys are mentioning speed as a factor of load...
I was on I-10 west of Kerrville two days ago doing the 80mph speed limit (in an unloaded pickup) and got passed by a dually pulling a huge triple axle toy hauler. Dude must have been trucking along about 85 - 90 mph... crazy.
Anyways, back on topic... sort of.
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Old 09-21-2021, 10:18 AM   #140
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I'm just messin with you... gotta love these weight threads!
About as much fund as tire life threads. Both filled with facts found in this and other RVing forums.
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