Great responses so far I will add that in our case I specifically wanted 2wd for one reason... to keep me off the really rugged roads. This truck is used to safely move our house from point a to point b. No need to add additional wear and tear. Kind of like being a sugar addict... if I stick candy in the house I will eat it. No need to be tempted with 4wd.
While towing I have needed 4wd twice. First time a lite tug from another truck got me loose. Second time I had to lay down wood under the tires to get loose. Neither episode would convince me to get 4wd.