BF Goodrich AT is a great tire on the dunes, with great performance on pavement. Don't know how it fares in snow, but those tires never let me down when driving my underpowered 3.0 L Montero, I took them very deep into the desert and could always get myself out of sticky situations without leaving my seat.
Currently have cooper discoverers on my H3, never got stuck in the sand with these either and I love them, but I still miss the amount of control I had with the BFs when I'm driving on the edge of a dune.
Never tried the MT versions of these though, hope this helps.