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Not too sure about the Duratracs since I have had nothing but BFG's on my truck. Spent about 5 years driving between Seward and Valdez, AK with no problems on my All Terrains. I think you would be happy with either.
My Father has BFG's on his truck and is happy with them, I think between the two you really cant go wrong both good tires. I just ended up taking the good years for the higher inflation rating.
As for spacers and lifts I really like the way the truck looks now and don't want to change it with those things if i can avoid it. I think I will try and trim the fenders some to get more room for flex.