Glad no harm was made to you or your family with this failure.
Nice Vid by the way, very Explicit.
From what I can see, It is not a silverado failure. I just went under mine, and no bolt will ever touch the brake lines even on full suspension compression.
Now, we have a couple of hybrid tahoes, and one 5.3L flex fuel tahoe. They all have the same suspension, so your failure could be related to all Tahoes, not only hybrids.
From this pic I can see that bolt 1 is the one that wear out your brake line.
Tomorrow I'll go under the tahoes and will try to take some pics out of them.
We don't use them to tow, but full passenger and cargo, will have the same effect on bumpy roads.
Thanks for the heads up for all of us.
And, try not to give up on GM just for a few Arses that made to work with them ! just my 2 cents