Below is a pic of my solution. Steel cable attached to spring shackle under truck frame, threaded thru 1/8 in hole in plastic bumper, attached to safety cable.
Whoever said that the safety cable should be longer than the chains is 100 pct. correct. If the chains don't break on their own, you don't want to increase the load on them by locking up the trailer brakes, right? That might cause the chains to fail when otherwise you might have maintained control.
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