I just put Cooper Discoverer ATPs on my 2013 F350 I use for my landscape business. 285-70-17 E rated. They're similar to the AT3s. Pep Boys carries the AT3s and Discount Tire carries the ATPs around here.
I have been very pleased with the ATPs. One of the reason I bought them was a friend who has a Ram 2500 has them on his truck with 25,000 miles now. The tread still looks great. 55,000 mile warranty, too.
Ride and performance so far has been exceptional. Toyo and Nitto are great tires but I have no experience with them. But I'd get the Coopers again if they keep doing as good as I expect them to.
