I had no hope of making it, but damn I sure did try. The hop is what killed the climb
That last bit is where almost everyone gets stalled. Lots of youtube videos of the same thing.
And coming back down is always where things go bad, if the truck gets out of shape on the way up (almost always if you don't make it) then you get-what-you-get on the way back down. For those that haven't driven it, it's too steep to be able to stop and think about what happens going back down, the truck just slides back down the hill even dry (with Moab slickrock).
And, you tried it with water in the bottom. You took one of the harder obstacles in any of Moab and made it 50% harder. There are very few that can make that one period, let alone in the wet. And you got pretty close, in a fullsize Blazer; you may have been in a very small group (I don't know of any) if you made it in a full body truck with water.
Sounds like you're all safe, and I'm sure you and the truck will live to see more good wheeling. I was shook for a couple weeks after my first big roll but if you want to keep going, get back on the horse. I watched my rollover video way too much, trying to figure out what I did wrong. In the end, learn if you can and move on. Sometimes things just happen and happen fast, I feel like that's what happened to you. One bad kick and the truck isn't square any more.
You will, on the other hand, have a great video to show people forever that will blow the minds of 99.9% of the population both in vehicle capability and driver skill. That's pretty awesome.
-Chris