Out of my own experience with an aluminum tail housing braking off dumping the t-case on the interstate, I can just advice everyone to run a second crossmember, second tranny mount and an adapter like I have used on my truck. Works perfect and gives you the extra insurence in case something does let go, that the t-case will stay unter the truck.
here are the pics...
mock up:
final install:
final install close up:
2nd cross member from the side:
