Lesson learned - concrete landing and launching a boat = bad time for 4wd...
especially with:
I had the wheels turned a lot (steering wheel almost locked)
When in 4WD, the wheels have to be able to slip some. (Outside wheels on a curve travel further than inside wheels.)
Chock it up to a lesson learned. I also agree that you should now try it in your driveway WITH THE WHEELS STRAIGHT, just to make sure nothing is blown/destroyed (highly doubtful).
-G