One says he needs it on his hilly ground. Mine is 15 to 20% on most of it, and I don't need it. I don't slid or spin, on it and it is kind of sandy to boot. Some times when I get on a real steep little hill it does spin, the I use the dif lock and it come right out of it. I drove on snow and ice most of my life and with 2wd drive, I still would do it with 2wd if I lived there. I think of a fellow I use to work with, he said most of his hunter friends had 4wd on theie trucks, and that when he needed to start worrying with his 2wd, so did they, for they were just about through going also. Maybe he and I were just better drivers, I don't know.