I've read good reviews on the Nitto Ridge Grabbers, and am having them installed on my F250 Powerstroke tomorrow. They are a hybrid design between an AT and MT tire...
FYI, I was going to purchase the Toyo RT which is another hybrid AT/MT tire. They were about $30 more per tire and have a mileage guarantee...
I went with the Nitto's for two reasons, their load capacity and price..
Nitto 35x11.5 20R E rating is 3525lbs. @70lbs.
Toyo 35x12.5 20R E rating is 3195lbs. @ 65lbs.
Having said that, both tires' rated combined load capacity exceed my F250's rear axle weight rating of 6k lbs.