Cons= Interco tire(superswampers) are loud, wear poorly on highway, and I believe a decrease in load capacity. Not sure if that make a E ply or not.
Pros= Look great, never had any real problem with snow and/or mud, comes in bias or radials(choice is good), get people asking about your truck ALL the time(might be a con somedays) come in almost every size imagineable. Choice is still good
My Swampers that I had on my old 99 were great in the dirt, but since I do mostly pavement driving I only got about 5K-6k out of a set of on 4. so you will have to buy two more. Price adds up quick.
I got the best milage out of general muds( since you want an aggressive tire) 7-8k miles a set
Good luck
Chris