No offense guys.. but I'm glad I wasn't there.
I see several things that look very dangerous to me.
First hooking bumper to bumper like that is a very good way to break things.
Second, using a chain without some kind of recoil dampner is a huge no-no.
Third, I may be wrong, but it appears that the chain is looped over a ball on the powerstroke.. this is an even bigger no-no.
Sorry to hear your broke your truck. Glad to hear nothing else broke and no one was injured.
I don't mean to be a spoil sport, or sound like the "safety police" it's just that I like everyone here, and what they contribute, and I'd hate to lose any of you.