All correct information. And I would be reaching the same conclusion, except one key piece of data has been ignored…
… that results an inaccurate conclusion.The key piece of information to understanding this fact is the (I’m assuming proper) arrangement of a shackle-type tandem connection, which allows free pivoting from a point between the axels, but it also holds true for tandem torsion bar arrangements.
(And, after all, it was ignoring one single key piece of data that led all science for centuries to the erroneous conclusion that centrifugal force exists). So we are in good company.
Include this piece of data by examining the mechanicals of the pivots at the ends of the shackles and I am confident, particularly given your engineering background, that you will reach the same conclusion as I have.
The mechanical configuration of the connections were engineered specifically (by mechanical engineers, I would expect) to reach that end. You might find some bodged-together trailers that lack this feature, but I am referring to a modern, properly-done installation.
A search online might result in a photo of the pivot bracket that attaches the trailer frame to the axel assembly.
Cheers- Brian.
