
TL;DR - I had to cut my trip short when another leaf - this time the main leaf - broke on the first day of a 4 day adventure. I've now replaced the leaf springs, solving the problem.
For the second time in six months, a leaf spring broke. In fact, a second leaf - this time the main leaf, and the only one that spans from the front hanger to the rear shackle - broke from the same leaf pack, and in the same location as the first leaf that'd broken.

The situation this time was a bit more dire, but we were lucky that a jerry-rigged-ratchet-strap-bush-fix was able to keep the rear axle from sliding out from under the truck, eventually making it all the way home before I quickly replaced the leaf springs with another brand new leaf pack from Alcan Spring.
I'd planned to do this at the same time that I replaced the rear axle housing with a new fabricated Diamond Axle housing, but apparently that was the wrong call. At any rate, problem solved.

I'll also be adding a couple plates and some grade 10.9 bolts to the OSK (Oh Shit Kit) so that should something like this happen in the future, I can apply a bit more robust repair. I really like this solution because it's not heavy - especially compared to carrying a full leaf, for instance - but is quite effective.
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