[freebeard]

It looks like every I-beam up to the middle of the trailer is bent. It may be repairable, unlike the first example.

Wrought Iron:

https://upload.wikimedia.org/wikipedia/commons/thumb/b/b3/Pike_County_Wrought_Iron_Bridge.jpg/640px-Pike_County_Wrought_Iron_Bridge.jpg

Cast iron:

http://justacarguy.blogspot.com/2016/01/this-is-just-design-beauty-too-bad-more.html

Steel:

https://en.wikipedia.org/wiki/Forth_Bridge#/media/File:George_Washington_Wilson.jpg