I wouldn't be touching Mclean without a winch right now, that combined with the potential damage that can be down due to the current conditions, it might be a good idea to postpone a bit until it dries some more.
If you need to go, the minimum should be 31" with 50-70+ tread MT's, no AT's. That is bare minimum. Like SilverFox said, have good recovery points front and back and the right gear to use them.