Just replaced the Cooper Discovery tires that I put on exactly two years and 40K miles ago. Very poor guality tire. They just would not handle truck usage.
Did some research, and listend to folks and ended up putting a set of Toyo M55's on last week. There known to be tough tire, only made in E class 10 ply, M&S rated. This a no nonsense commercial duty tire.
The tread is a little agressive if you spend alot of time on paved roads in good weather. As they sing at higher speeds on the pavement.
For my needs and geographic location, and the fact 5 -6 months of the year driving is crappy. I am hoping these tires will give me good service.
As a second choice I was considering the Goodyear Wrangler Silent Armour, but I got talked out of getting the Toyo's last time around so I was bound to give them a shot this time. In the past I have had good luck with Goodyear and Goodrich, and the best tread life I ever got was from a set of Kelly Springfields.
For the gualiy of tire we need to handle the weight and power of these trucks, none of the tire choices are cheap.