Each of the two trailers had one pivoting support to carry one end of the load. I’m sure these towers have been moved this way many times but, as I was watching it go by, it just seemed awfully fragile.
Here is a link to the video
https://www.kwtx.com/2024/04/27/two-people-dead-another-injured-fatal-crash-involving-18-wheeler/
They say it was distillation tower was 217 feet long and it was hauled on two trailers with each trailer having 40 tires.
So it was not some 18 wheeler accident as most news reports have claimed.
Here is a view of another similar unit spreading its weight over two structures.