I have the duratrak mud terrains on my F350, the thing is never driven empty and I have around 30k miles on them and they're down to 50% or so, I've never gotten that thing stuck but haven't tried that hard, occasionally it needs 4x4 to keep moving, if it starts slipping there drop the pressure to 15-20psi and it's good to go (with a 7300lb truck with a 3000lb camper in back towing something or other, the tires are squishy there...). I think the problem with new stuff is no one wants sidewalls anymore... I'm a fan of sidewalls, gives you more options and rides better...