Never run all terrains or ht tread much,always run mud terrains. Most of the people here at home are having good luck with the toyo at,I live in farm country,every one here runs more gravel miles than highway if they farm or have cattle. The michelins are also something I here alot of good out of. I run the toyo mt,in a load range E. There on a 08 half ton silverado crew with a 12000 pd warn winch and brushguard, with a full load of tools in the back. Not as heavy as your dually,but it see gravel daily when I am home. I have logged about 20000 miles on them, with no signs of wear. I feel like the at tire would be a lot better. We never had much luck with firestones on the gravel,seemed like thay came apart to quick. But I have never tried the transforce at either. I do know the at toyo rides good. LUTT