That's. 3/16 and 1/4 steel....if "it" breaks I don't want to be in it when it hits something big and heavy enough to break it.....I'm pretty sure whatever is occupying the first 10 feet of the coach,would make sure you don't remember it.
Looks like weak link would be the dowel pin,it breaks/shears... then the "rails" come into play....it does slid into rails,to locate bottom "U" and then slids and then latches....if that is how it works...id driv it
Oh and why do "you" need it to swivel when driving?....so you can make a sammich?
On pirate years ago someone built some out of dom tubing,grease fittings and all,very cheap and worked great