I'm running 285/75/18 Ridge Grapplers on my F150. I've got around 5k on them. They've been on rocks, through mud, towed and straight hwy. They are quite and ride smooth. I came from Toyo MT which rode rough and were loud. No perceptible difference offroad. I love the Ridge Grapplers and will run them again when these wear out. The only downside is they are on the heavier side of comparable tires in the same size.
I had a set of Cooper AT3's on my truck and my wife's Nissan NV van. 6 of the 8 total tires were already cupping in less than 4k miles. I had this confirmed by two different shops. I won't run Cooper again and can't recommend them.
My business partner has a set of Nitto Ridge Grapplers in 35x12.5x20 on his F250, he's got 25k on his, no noise, still ride smooth and tread is roughly half worn.