The blocks may be going back in just to give the truck the rake back which would help with towing. Just have to get new u bolts as I don't want to reuse a thing like that.
The transfer case is a Borg Warner 4406 with torque on demand. It only transfers power to the front when the rear slips. I don't know much about it but I know people have had good luck with it in racing applications where they are supercharging these trucks and even using nitrous without having to modify the transfer case.
The truck came with the 7 pin, 3.73's a 10000lb hitch.
We do travel pretty light and don't plan on hauling water. We also can use another vehicle for my wife and kids and luggage if needed to keep the weights down.
I do have a fair bit of experience towing. We don't plan on winning any races with this setup and know we need space to stop. My work truck is a 2011 F550 that I tow a large trailer for my telehandler. So I am used to towing heavy weights. Way different application. But I've been towing since I got my license.