check
www.treadwright.com
i bought the warden a/t (bfg a/t tread pattern) for my girlfriends grand cherokee in 31/10.5/15 2 years ago and they are great. they have worn a little more than the bfg a/t's on my wagoneer, but hers does get driven more. i'd say after almost 20,000 miles they still look pretty new. same performance as the bfg's.
i had the goodyear authority's on my 01 s10 blazer and they were fine. after 25k they started to wear a little un-even, but that was most likely due to bad shocks and worn ball joints. now in contrast, i recommended them to my dad for his 2500hd, and they fell apart after a year. i put around 30k on mine in 3 years before i sold it and the tires still looked good.
i currently have 31/10.5/15 Definity Dakota M/T's from pep boys on my B2. they are only about 6 months old with >5k on them, but i can tell you they work really well off road, mud, sand, gravel, loose dirt, wet fields...dont know about snow yet, and since its 72 here...probably wont this year. they are a typical M/T tread, compareable to the older BFG M/T tread pattern. with the windows up and the radio on, i can barely hear the road howl at 65mph. windows down around town, they are about as loud as any other M/T, the exception being the KM2's. they are the quietest M/T i know of.
to sum up, the authority's would be fine for a light vehicle, but anything full size or definetly heavy duty, like a big diesel, i would stay away.
i have worked around tires, in tire shops, on drag strips, orv parks, ect. and my boss is a Mickey Thompson dealer as well as sponsored NHRA drag car owner. well, former owner. most tires fail due to the following: Improper allignment, psi, suspension or steering parts(ball joints, shocks, struts, tie rods, ect) being worn out, or exceeding the weight or speed rating of tires. it happens, due to those circumstances, more often than not. that being said, sometimes you just do get a bad tire. getting 4 bad tires at once is pretty rare.
hope that helps