Just an addition, I've been running the BFG AT's for ~10 years. I haven't seen problems with gravel tearing them up, then again I probably only got 30,000 miles (mostly pavement) on my last set. Wear was pretty much non-existent at that point, they were simply starting to dry rot at that age. There were some cuts in them from large rocks, but no major missing tread, etc.
One thing I noticed when comparing my load range C BFG's with my Dad's store branded load range E, were that the BFG's had FAR more sidewall plys. I think it was 8 for the BFG, 3 for the store brands?
In any case, airing my BFG's down makes for a HUGE difference in ride quality. If airing up/down for you is no big deal, probably not a factor. I run them at 40 on the street, 20 off pavement, and it literally is night and day. If not willing to air down, I would probably heed the comments from those who said theirs rode rough comparatively, and consider something else. At 40PSI, I literally can't stand the feel/sound of the truck slamming into potholes.