Where we ride its pretty much 4x4 all the time, lets put it this way, you really need 4wd to even get to the cabin before the quads get off the trailer.

Problem with 4x2 is when you get on the throttle an its 8 degrees out and icy up an incline it gets very squarely, AWD helps but the rear still moves around.
Justin has a pic of the driveway, he can post it if he wants.