I have had 2 sets of the Nitto Terra Grapplers,on my 2006 Dodge in sig, one in 285 17 then 275/65/20. Handle well, tow heavy loads very well. Not great in Snow and or lite mud. Downside is treadlife. My G2's in the 20's have 15K, and at the wear rate will be done by 30K or less.
I too am looking at an alternate. My other tow vehicle is a 2003 Chev 2500 with 8.1 BB Gas and Allison 5 speed running Cooper RTX, very happy with this tire although in a 16" size. Thinking I will go Cooper on my Dodge .... Or Toyo AT. BFG is a great tire, however I have had to have thes tires rebalanced on my wifes F150 a couple times. Good tread in snow [AT's] Good luck as I have yet to find a tire running on a diesel and towing moderately that will get 30 K mile with decent tread left.