I have been lead to believe that fish tailing trailers is the result of improper loading by not having the CG forward of the axles. From what little bit I know about physics it makes sense to me. Can anyone confirm or deny?
If true then those accidents should be chalked up to human mistake, not trailer type.
xtn
Trailer sway or fishtailing is indeed a predictable consequence of improper load distribution.
Yes, the C of G needs to be AHEAD of the axle and in the case of a tandem axle trailer it should almost always be ahead of the front axle's center line.
Measure this out some time, i.e. distance from hitch ball to axle (or mid point between axles) then how far back from the coupler the C of G would be to produce the desirable 10 to 15% tongue load.
Yeah, between 90 and 85% of the way back to there (-:
This will almost always be ahead of the front axle's center line on a tandem trailer, even on a very short trailer.
Odd though it may seem - - and to some this sounds like a contradiction, you still want a little bit more load on the REAR axle than on the front one.
FORTUNATELY you get this just about automatically when you set the ball height - with MOST trailers.
I believe the reason that some trailers sway behind one vehicle and not another is often caused by different ball heights, i.e. the family TRUCK squats less than the family SUV (over simplified).
OK that is most of the mere fizzzix.
As to whether trailer type is responsible for accidents or human error...
I could argue it either way;
Yes, humans can do things right and they can do them wrong.
Designs can permit or preclude particular consequences stemming from human errors.
Designs can also "Encourage" certain types of human error.
So, know what you are doing, know how to do it right, know when you have done it wrong and FIX THAT ! (-: