Two folks I have camped with both USED to own 2wd. I rarely use mine, but I have it. As mentioned, it helps with slippery situations. When I most use mine is on gravel roads. I feel it is easier on my truck.
From a towing standpoint it adds a bit of weight to the front of TV. That does subtract from the cargo carrying capacity somewhat though, but if you are that close then my feeling is you are already there.
From a dealer standpoint, that's what sells. And they are right with resale points also.