Originally Posted by mcbrew
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.....