I've had good luck with BFG MT's. Good road manners, good offroad manners. I ran some Goodyear MTRs, not very long-they were borrowed. I don't think they were any better offroad. They were more noisy onroad. IMHO.
A good friend of mine does alot of field tiling. They used a lot of Kuhmo mud tires. I got them to run a set of BFG MT's. Their comments were the kuhmos don't clean out, the BFGs do. All their trucks run BFG's now.
Another good tire I think is the Super Swamper Truxxus MT. It comes in load range "E" ratings. It is a little softer rubber compound then the BFG so I don't think they will wear as well, but with the proven TSL pattern they probably dig well.
Michael