This subject never gets old. It is like "Which type of anchor is best?" with boaters.
Looking at the responses, the answers are always the same. Most who have 4wd have never needed it in a RV using situation. 2WD works just fine. They do use it for work, for sightseeing on 4WD trials or because they really do need 4WD in winter. Some have it "just incase they need it". It is their security blanket I guess.
Never owned a 4WD here. Being 2WD makes me think before attempting to go somwhere risky. My security blanket is a piece of towline kept in the truck fulltime. Tim the toolman is never far. He probably does not have a towline with him but he does have 4WD which he has not used in a long time & is always looking for a reason to have it. He can tow me out if I get stuck. He will be waiting a long time for that to happen too. 7 years, over 140,000 miles & have not been in need of a tow yet.