Anti-Sway Bar - Page 7 - Fiberglass RV


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Old 02-15-2012, 09:09 PM   #85
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Name: Jesse
Trailer: 1984 Scamp 13'
Maryland
Posts: 818
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Originally Posted by gmw photos
Well, okay, how about this: I just looked online for a 2011 Scooby-Doo Outback. It says, tow capacity 3000 pounds. Tongue weight must never exceed 200 pounds. Tongue weight must be between 8 and 11% of trailer weight. According to my handy dandy calculator, 8 to 11 percent of 3000 pounds equals 240-330 pounds. Hmmm, the plot thickens. Apparently the "tongue weight guys" were out playing golf the day the "tow capacity guys" were having their discussion.
This will really blow your mind: in Europe, where a LOT of people tow with cars, the same Subaru Outback is rated to tow 4,400 pounds and only 185 pound tongue weight. That's just 4%!

The 10% rule is not written in stone. It works most of the time in the US, where most people tow with pickup trucks and drive too fast. In Europe, they usually drive smaller cars and drive slower when towing.
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Old 02-15-2012, 09:29 PM   #86
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Name: george
Trailer: FunFinder
Missouri
Posts: 455
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Originally Posted by mcbrew View Post
This will really blow your mind: in Europe, where a LOT of people tow with cars, the same Subaru Outback is rated to tow 4,400 pounds and only 185 pound tongue weight. That's just 4%!

The 10% rule is not written in stone. It works most of the time in the US, where most people tow with pickup trucks and drive too fast. In Europe, they usually drive smaller cars and drive slower when towing.
I also have noticed that in Europe, a lot of the "caravans" as they call them are single axle. You'll see 24' to 28' trailers with a single axle, where in North America and Australia these length trailers are typically tandem axle.

A guess would be ( and that's all the following is: a guess ) that you could likely get by with slightly less measured static tongue weight with a single axle than you could with the same trailer with a tandem. I'll do some poking around and see if I can verify that line of thought.

There are certainly different ways of looking at this. For instance, in Australia, I see some of their caravans are tandem axle, with independent suspension. And yet, over here, I believe it's that Dexter specifies to designers: "not recommended to use independent suspension with tandem axles", and "prohibited to use independent suspension on triple axles".

It has to do with how each axle gets loaded as each wheel passes over the bump. Equa-Flex is one solution to this....but now we're going way off topic.....
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Old 02-15-2012, 10:27 PM   #87
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Name: George
Trailer: Waiting for the Sprinter van and designing the converion modules.
Oregon
Posts: 629
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Originally Posted by gmw photos View Post
I also have noticed that in Europe, a lot of the "caravans" as they call them are single axle. You'll see 24' to 28' trailers with a single axle, where in North America and Australia these length trailers are typically tandem axle.

A guess would be ( and that's all the following is: a guess ) that you could likely get by with slightly less measured static tongue weight with a single axle than you could with the same trailer with a tandem. I'll do some poking around and see if I can verify that line of thought.

There are certainly different ways of looking at this. For instance, in Australia, I see some of their caravans are tandem axle, with independent suspension. And yet, over here, I believe it's that Dexter specifies to designers: "not recommended to use independent suspension with tandem axles", and "prohibited to use independent suspension on triple axles".

It has to do with how each axle gets loaded as each wheel passes over the bump. Equa-Flex is one solution to this....but now we're going way off topic.....
A few years ago I had the boat trailer with the triple axle independent suspension (torsion axles). The hitch height was more critical than on interconnected triple axle leaf springs suspension. This trailer tracked TV perfectly. I wish that my two axles Bigfoot would have an independent suspension. After modifying Bigfoot's suspension with 4 low pressure air springs my trailer tracks well but I would still prefer torsion axles.

With my narrow parking problems I recently evaluated EU style trailer movers directly attached to a trailer and in the process I have not seen a single or two axles trailers in EU with spring leaf suspension. I would like to understand Dexter ‘s love affair with leaf springs. I think that a primary reason for EU style movers not being available in US is difference in tongue weight. Am I still on your decoupling theme Norm?

George.
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